Please answer the following question: Information:  - Jazz fusion (also known as jazz-rock) is a musical genre that developed in the late 1960s when musicians combined aspects of jazz harmony and improvisation with styles such as funk, rock, rhythm and blues, and Latin jazz. During this time many jazz musicians began experimenting with electric instruments and amplified sound for the first time, as well as electronic effects and synthesizers. Many of the developments during the late 1960s and early 1970s have since become established elements of jazz fusion musical practice.  - The Grammy Award for Best Vocal Arrangement for Two or More Voices was awarded from 1977 to 1986. From 1977 to 1981 it was called the Grammy Award for Best Arrangement for Voices. The award is presented to the arranger of the music.  - In music, an arrangement is a musical reconceptualization of a previously composed work. It may differ from the original work by means of reharmonization, melodic paraphrasing, orchestration, or development of the formal structure. Arranging differs from orchestration in that the latter process is limited to the assignment of notes to instruments for performance by an orchestra, concert band, or other musical ensemble. Arranging "involves adding compositional techniques, such as new thematic material for introductions, transitions, or modulations, and endings... Arranging is the art of giving an existing melody musical variety".  - A cappella (Italian for "in the manner of the chapel") music is specifically group or solo singing without instrumental accompaniment, or a piece intended to be performed in this way. It contrasts with cantata, which is accompanied singing. The term "a cappella" was originally intended to differentiate between Renaissance polyphony and Baroque concertato style. In the 19th century a renewed interest in Renaissance polyphony coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists led to the term coming to mean unaccompanied vocal music. The term is also used, albeit rarely, as a synonym for alla breve.  - Janis Siegel (born July 23, 1952) is an American jazz singer with the vocal group The Manhattan Transfer.  - 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".  - m-pact is a Los Angeles, California-based "pop-jazz vocal group" founded in June 1995. It is most notable for winning the Los Angeles Music Award for Vocal Group of the Year, as well as the 1999 Billboard "Unsigned Band of the Year" award.  - Weather Report was an American jazz fusion band of the 1970s and early 1980s. The band was initially co-led by the Austrian-born keyboard player Joe Zawinul, the American saxophonist Wayne Shorter and Czech bassist Miroslav Vitouš. Due to creative and financial disagreements Vitouš left the band after a few years. Zawinul took increasing control and steered the band towards a more funk, R&B oriented sound. Other prominent members at various points in the band's lifespan included bassists Alphonso Johnson, Jaco Pastorius and Victor Bailey; and drummers/percussionists Peter Erskine, Alex Acuña, Airto Moreira and Chester Thompson.  - The City of New York, often called New York City or simply New York, is the most populous city in the United States. With an estimated 2015 population of 8,550,405 distributed over a land area of just , New York City is also the most densely populated major city in the United States. Located at the southern tip of the state of New York, the city is the center of the New York metropolitan area, one of the most populous urban agglomerations in the world. A global power city, New York City exerts a significant impact upon commerce, finance, media, art, fashion, research, technology, education, and entertainment, its fast pace defining the term "New York minute". Home to the headquarters of the United Nations, New York is an important center for international diplomacy and has been described as the cultural and financial capital of the world.  - A Grammy Award (originally called Gramophone Award), or Grammy, is an honor awarded by The Recording Academy to recognize outstanding achievement in the mainly English-language music industry. The annual presentation ceremony features performances by prominent artists, and the presentation of those awards that have a more popular interest. It shares recognition of the music industry as that of the other performance awards such as the Emmy Awards (television), the Tony Awards (stage performance), and the Academy Awards (motion pictures).  - The Manhattan Transfer is an American a cappella, jazz fusion/pop music group founded in 1969 in New York City and still active in the 2010s. There have been two editions of the group, with Tim Hauser being the only person to be part of both. The first group consisted of Hauser, Erin Dickins, Marty Nelson, Pat Rosalia and Gene Pistilli. The second version of the group, formed in 1972, consisted of Hauser, Alan Paul, Janis Siegel and Laurel Massé. In 1979, after Massé was badly injured in a car accident, she was replaced by Cheryl Bentyne. The group's long-time pianist, Yaron Gershovsky, accompanied the group on tour and served as music director. Trist Curless from the Los Angeles a cappella group m-pact became a permanent member in October 2014 following Hauser's death. The group won various Grammy Awards in the 1980s. The group won its first Grammys in 1980 for their cover of Weather Report's "Birdland". Their recording earned them their first Grammy Award for Best Jazz Fusion Performance and the group's first Grammy Award for Best Vocal Arrangement for Two or More Voices, to Janis Siegel for her arrangement of the song. Their cover of "The Boy from New York City", won them the Grammy Award for Best Pop Performance by a Duo or Group with Vocal, and "Until I Met You (Corner Pocket)" earned them a Grammy for Best Jazz Performance, Duo or Group. In 1982, the group won another Grammy for its rendition of "Route 66". In 1985, the group won Grammys in two categories: Best Jazz Vocal Performance, Duo or Group, and Best Arrangement for Voices. The group was inducted into the Vocal Group Hall of Fame in 1998.  - Alan Paul (born November 23, 1949, Newark, New Jersey) is a Grammy Award-winning singer and composer, best known as one of the founding members of the current incarnation of the vocal group The Manhattan Transfer.  - Cheryl Bentyne (born January 17, 1954 in Mount Vernon, Washington) is a Grammy-winning singer who was a member of the vocal quartet The Manhattan Transfer.  - Timothy DuPron "Tim" Hauser (December 12, 1941  October 16, 2014) was a singer and founder-member of the vocal group The Manhattan Transfer. With Hauser as one of the vocalists, The Manhattan Transfer won ten Grammy Awards.  - The Vocal Group Hall of Fame (VGHF) was organized to honor outstanding vocal groups throughout the world by Tony Butala, also the founder (and now only surviving original member) of The Lettermen. Headquartered in Sharon, Pennsylvania, United States, it includes a theater and a museum.  - "The Boy from New York City" is a song originally recorded by the American soul group The Ad Libs, released as their first single in 1964. Produced by Jerry Leiber and Mike Stoller, the song peaked at No. 8 on the US "Billboard" Hot 100 on the chart week of February 27, 1965. Though the group continued to record many other singles, they would never repeat the chart success of "The Boy from New York City".  - `` Chanson D'Amour '' ( `` Love Song '' ) is a popular song written by Wayne Shanklin . A 1977 recording by the Manhattan Transfer was an international hit , reaching # 1 in the UK Singles Chart , and Australia .  - The Grammy Award for Best Jazz Fusion Performance was an award presented at the Grammy Awards, a ceremony that was established in 1958 and originally called the Gramophone Awards, to recording artists for works (songs or albums) containing quality jazz fusion performances. Honors in several categories are presented at the ceremony annually by the National Academy of Recording Arts and Sciences of the United States to "honor artistic achievement, technical proficiency and overall excellence in the recording industry, without regard to album sales or chart position".  - The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign country in western Europe. Lying off the north-western coast of the European mainland, it includes the island of Great Britain (the name of which is also loosely applied to the whole country), the north-eastern part of the island of Ireland, and many smaller islands. Northern Ireland is the only part of the UK that shares a land border with another sovereign statethe Republic of Ireland. Apart from this land border, the UK is surrounded by the Atlantic Ocean, with the North Sea to its east, the English Channel to its south and the Celtic Sea to its south-south-west, giving it the 12th-longest coastline in the world. The Irish Sea lies between Great Britain and Ireland. With an area of , the UK is the 78th-largest sovereign state in the world and the 11th-largest in Europe. It is also the 21st-most populous country, with an estimated 65.1 million inhabitants. Together, this makes it the fourth most densely populated country in the European Union.  - Wayne Shanklin was an American singer, songwriter and producer. His best known compositions were "Jezebel", "Chanson D'Amour (Song of Love)", and "The Big Hurt".  - The Official Charts Company (previously known as the Chart Information Network (CIN) The Official UK Charts Company and also referred to Official Charts) is a British inter-professional organisation that compiles various "official" record charts in the United Kingdom, including the UK Singles Chart, the UK Albums Chart, the UK Singles Downloads Chart and the UK Album Downloads Chart, as well as genre-specific and music video charts. The OCC produces its charts by gathering and combining sales data from retailers through market researchers Millward Brown, and claims to cover 99% of the singles market and 95% of the album market, and aims to collect data from any retailer who sells more than 100 chart items per week.  - The UK Singles Chart (currently entitled Official Singles Chart) is compiled by the Official Charts Company (OCC), on behalf of the British record industry, listing the top-selling singles in the United Kingdom, based upon physical sales, paid-for downloads and streaming. To be eligible for the chart, a single is currently defined by the Official Charts Company (OCC) as either a 'single bundle' having no more than four tracks and not lasting longer than 25 minutes or one digital audio track not longer than 15 minutes with a minimum sale price of 40 pence. The rules have changed many times as technology has developed, the most notable being the inclusion of digital downloads in 2005 and streaming in 2014.    What entity does 'chanson d'amour' has the relation 'performer' with?
Answer:
the lettermen