Information:  - Jazz is a music genre that originated amongst African Americans in New Orleans, United States, in the late 19th and early 20th centuries. Since the 1920s jazz age, jazz has become recognized as a major form of musical expression. It emerged in the form of independent traditional and popular musical styles, all linked by the common bonds of African American and European American musical parentage with a performance orientation. Jazz is characterized by swing and blue notes, call and response vocals, polyrhythms and improvisation. Jazz has roots in West African cultural and musical expression, and in African-American music traditions including blues and ragtime, as well as European military band music. Although the foundation of jazz is deeply rooted within the Black experience of the United States, different cultures have contributed their own experience and styles to the art form as well. Intellectuals around the world have hailed jazz as "one of America's original art forms".  - The cello (; plural cellos or celli) or violoncello is a bowed string instrument with four strings tuned in perfect fifths. The strings from low to high are generally tuned to C, G, D and A, an octave lower than the viola. It is a member of the violin family of musical instruments, which also includes the violin and viola.  - Henry James "Red" Allen (January 7, 1908  April 17, 1967) was a jazz trumpeter and vocalist whose style has been claimed to be the first to fully incorporate the innovations of Louis Armstrong.  - Mandobass is the largest (and least common) member of the mandolin family, sometimes used as the bass instrument in mandolin orchestras. It is so large that it usually isn't held in the lap, but supported on a spike which rests on the floor. The neck-scale length on a full-size mando-bass is similar to that of a standard orchestral double bass viol: about 43" (110 cm). The instrument is otherwise similar to the smaller, higher-pitched members of the mandolin family, having a fretted neck, a headstock with geared tuning machines, and a large resonating body oftenbut not alwaysshaped like that of other mandolins.  - Ralph Edmund Stanley (February 25, 1927  June 23, 2016), also known as Dr. Ralph Stanley, was an American bluegrass artist, known for his distinctive singing and banjo playing. Stanley began playing music in 1946, originally with his brother Carter as part of The Stanley Brothers, and most often as the leader of his band, The Clinch Mountain Boys.  - Country music is a genre of United States popular music that originated in the southern United States in the 1920s. It takes its roots from the southeastern genre of United States, such as folk music (especially Appalachian folk music), and blues music. Blues modes have been used extensively throughout its recorded history. Country music often consists of ballads and dance tunes with generally simple forms and harmonies accompanied by mostly string instruments such as banjos, electric and acoustic guitars, dobros and fiddles as well as harmonicas. According to Lindsey Starnes, the term "country music" gained popularity in the 1940s in preference to the earlier term "hillbilly music"; it came to encompass Western music, which evolved parallel to hillbilly music from similar roots, in the mid-20th century. The term "country music" is used today to describe many styles and subgenres. The origins of country music are the folk music of working-class Americans, who blended popular songs, Irish and Celtic fiddle tunes, traditional English ballads, and cowboy songs, and various musical traditions from European immigrant communities. In 2009 country music was the most listened to rush hour radio genre during the evening commute, and second most popular in the morning commute in the United States.  - Louis Armstrong (August 4, 1901  July 6, 1971), nicknamed Satchmo or Pops, was an American trumpeter, composer, singer and occasional actor who was one of the most influential figures in jazz. His career spanned five decades, from the 1920s to the 1960s, and different eras in jazz.  - Bluegrass music is a form of American roots music, and a related genre of country music. Influenced by the music of Appalachia, bluegrass has mixed roots in Irish, Scottish and English traditional music, and was also later influenced by the music of African-Americans through incorporation of jazz elements.  - Don Wesley Reno (February 21, 1926  October 16, 1984) was an American bluegrass and country musician best known as a banjo player in partnership with Red Smiley, and later with guitarist Bill Harrell.  - Appalachia is a cultural region in the Eastern United States that stretches from the Southern Tier of New York to northern Alabama, Mississippi and Georgia. While the Appalachian Mountains stretch from Belle Isle (Newfoundland and Labrador) in Canada to Cheaha Mountain in Alabama, the cultural region of Appalachia typically refers only to the central and southern portions of the range. As of the 2010 United States Census, the region was home to approximately 25 million people.  - Jerome John "Jerry" Garcia (August 1, 1942  August 9, 1995) was an American singer-songwriter and multi-instrumentalist, best known for his work with the band the Grateful Dead, which came to prominence during the counterculture era in the 1960s. Though he disavowed the role, Garcia was viewed by many as the leader or "spokesman" of the group.  - David Grisman (born March 23, 1945, in Hackensack, New Jersey) is an American bluegrass/newgrass mandolinist and composer of acoustic music. In the early 1990s, he started the Acoustic Disc record label to help spread acoustic and instrumental music.  - Franklin Delano Roosevelt Wakefield ( born June 26 , 1934 ) is an innovative American mandolin player in the bluegrass music style . Wakefield is known for his collaborations with a number of important and well - known bands , including Red Allen , Don Reno , Jerry Garcia , David Grisman , The Stanley Brothers , and the Greenbriar Boys .  - Music is an art form and cultural activity whose medium is sound and silence, which exist in time. The common elements of music are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics (loudness and softness), and the sonic qualities of timbre and texture (which are sometimes termed the "color" of a musical sound). Different styles or types of music may emphasize, de-emphasize or omit some of these elements. Music is performed with a vast range of instruments and vocal techniques ranging from singing to rapping; there are solely instrumental pieces, solely vocal pieces (such as songs without instrumental accompaniment) and pieces that combine singing and instruments. The word derives from Greek  ("mousike"; "art of the Muses"). In its most general form, the activities describing music as an art form include the production of works of music (songs, tunes, symphonies, and so on), the criticism of music, the study of the history of music, and the aesthetic examination of music. Ancient Greek and Indian philosophers defined music as tones ordered horizontally as melodies and vertically as harmonies. Common sayings such as "the harmony of the spheres" and "it is music to my ears" point to the notion that music is often ordered and pleasant to listen to. However, 20th-century composer John Cage thought that any sound can be music, saying, for example, "There is no noise, only sound."  - The mandola (US and Canada) or tenor mandola (Ireland and UK) is a fretted, stringed musical instrument. It is to the mandolin what the viola is to the violin: the four double courses of strings tuned in fifths to the same pitches as the viola (C-G-D-A low-to-high), a fifth lower than a mandolin. The mandola, although now rarer, is the ancestor of the mandolin, the name of which means simply "little mandola".  - The Stanley Brothers were an American bluegrass duo made up of brothers Carter Stanley (1925-1966) and Ralph Stanley (1927-2016). Ralph and Carter performed as The Stanley Brothers with their band, The Clinch Mountain Boys, from 1946 to 1966. Ralph kept the band name when he continued as a solo after Carter's death, from 1967 until his own death in 2016.  - American Roots Music is a 2001 multi-part documentary film that explores the historical roots of American Roots music through footage and performances by the creators of the movement: Folk, Country, Blues, Gospel, Bluegrass, and many others.  - The octave mandolin is a fretted string instrument with four pairs of strings tuned in fifths, G, D, A, E (low to high), an octave below a mandolin. It has a 20 to 23-inch scale length and its construction is similar to other instruments in the mandolin family. Usually the courses are all unison pairs but the lower two may sometimes be strung as octave pairs with the higher-pitched octave string on top so that it is hit before the thicker lower-pitched string. Alternate tunings of G, D, A, D and A, D, A, D are often employed by Celtic musicians.  - The Grateful Dead was an American rock band formed in 1965 in Palo Alto, California. Ranging from quintet to septet, the band is known for its unique and eclectic style, which fused elements of country, folk, bluegrass, blues, reggae, rock, improvisational jazz, psychedelia, and space rock, for live performances of lengthy instrumental jams, and for their devoted fan base, known as "Deadheads". "Their music," writes Lenny Kaye, "touches on ground that most other groups don't even know exists." These various influences were distilled into a diverse and psychedelic whole that made the Grateful Dead "the pioneering Godfathers of the jam band world". The band was ranked 57th by "Rolling Stone" magazine in its "The Greatest Artists of all Time" issue. The band was inducted into the Rock and Roll Hall of Fame in 1994 and their Barton Hall Concert at Cornell University (May 8, 1977) was added to the National Recording Registry of the Library of Congress. The Grateful Dead have sold more than 35 million albums worldwide.  - A record label or record company is a brand or trademark associated with the marketing of music recordings and music videos. Often, a record label is also a publishing company that manages such brands and trademarks, coordinates the production, manufacture, distribution, marketing, promotion, and enforcement of copyright for sound recordings and music videos; conducts talent scouting and development of new artists ("artists and repertoire" or "A&R"); and maintains contracts with recording artists and their managers. The term "record label" derives from the circular label in the center of a vinyl record which prominently displays the manufacturer's name, along with other information.  - An instrumental is a musical composition or recording without lyrics, or singing, although it might include some inarticulate vocals, such as shouted backup vocals in a Big Band setting. The music is primarily or exclusively produced by musical instruments. An instrumental can exist in music notation, after it is written by a composer; in the mind of the composer (especially in cases where the composer herself will perform the piece, as in the case of a blues solo guitarist or a folk music fiddle player); as a piece that is performed live by a single instrumentalist or a musical ensemble, which could range in size from a duo or trio to a large Big Band, concert band or orchestra.  - Carter Glen Stanley (August 27, 1925  December 1, 1966) was a bluegrass music lead singer, songwriter, and rhythm guitar player. He formed "The Stanley Brothers and The Clinch Mountain Boys" band together with his brother Ralph. The Stanley Brothers are generally acknowledged as the first band after Bill Monroe & the Blue Grass Boys to play in the bluegrass genre. According to some historians, their recording of "Molly and Tenbrooks" (aka "The Racehorse Song") marked the beginning of bluegrass as a genre.  - A mandolin (; literally "small mandola") is a musical instrument in the lute family and is usually plucked with a plectrum or "pick". It commonly has four courses of doubled metal strings tuned in unison (8 strings), although five (10 strings) and six (12 strings) course versions also exist. The courses are normally tuned in a succession of perfect fifths. It is the soprano member of a family that includes the mandola, octave mandolin, mandocello and mandobass.    Given the information, choose the subject and object entities that have the relation of 'occupation'.
Answer:
frank wakefield , mandolinist