Given the question: Information:  - Frank Vincent Zappa (December 21, 1940  December 4, 1993) was an American musician, composer, songwriter, producer, guitarist, actor, and filmmaker whose work is characterized by nonconformity, free-form improvisation, sound experiments, musical virtuosity, and satire of American culture. In a career spanning more than 30 years, Zappa composed rock, pop, jazz, jazz fusion, orchestral and "musique concrète" works, and produced almost all of the 60-plus albums that he released with his band the Mothers of Invention and as a solo artist. Zappa also directed feature-length films and music videos, and designed album covers. He is considered one of the most innovative and stylistically diverse rock musicians of his generation.  - Columbia Records (also known simply as Columbia) is an American record label owned by Sony Music Entertainment (SME), a subsidiary of Sony Corporation of America, Inc., the United States division of Sony Corporation. It was founded in 1887, evolving from an earlier enterprise named the American Graphophone Company, the successor to the Volta Graphophone Company. Columbia is the oldest surviving brand name in the recorded sound business, being the second major record company to produce recorded records. Columbia Records went on to release records by an array of notable singers, instrumentalists, and bands. From 1961 to 1990, its recordings were released outside the U.S. and Canada by the CBS Records label (which was named after the Columbia Broadcasting System) to avoid confusion with the EMI label of the same name, before adopting the Columbia name internationally in 1990. It is one of Sony Music's three flagship record labels alongside RCA Records and Epic Records.  - The Hampton Grease Band was an American rock band, beginning as a blues rock group in the late 1960s in Atlanta, Georgia. They performed with several major bands in this period, including Grateful Dead and the Allman Brothers. The band gained a reputation for wacky stage antics, and eventually garnered enough attention to sign to Columbia Records. They recorded a double album, "Music to Eat", which is apocryphally said to have been the second-lowest selling album in Columbia's history, second only to a Maharishi Mahesh yoga instructional record. This record compares with the likes of Captain Beefheart, Frank Zappa & The Mothers of Invention, and Pere Ubu.  - Don Van Vliet (born Don Vliet; January 15, 1941  December 17, 2010) was an American singer, songwriter, musician and artist best known by the stage name Captain Beefheart. His musical work was conducted with a rotating ensemble of musicians called the Magic Band (19641982), with whom he recorded 13 studio albums. Noted for his powerful singing voice and his wide vocal range, Van Vliet also played the harmonica, saxophone, and numerous other wind instruments. His music integrated blues, rock, psychedelia, and free jazz with contemporary experimental composition and the avant-garde. Beefheart was also known for often constructing myths about his life and for exercising an almost dictatorial control over his supporting musicians.  - Pere Ubu is a rock group formed in Cleveland, Ohio, in 1975. Despite a variety of long-term band members, singer David Thomas is the only constant. Describing their sound as "avant-garage," Pere Ubu's work drew on diverse sources such as rock music, musique concrète, performance art, and the derelict industrial environments of the American midwest. The group's name is a reference to "Ubu Roi", an avant-garde play by French writer Alfred Jarry. They are usually categorized as "underground rock", having rarely achieved commercial success.  - 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.  - Glenn Phillips is a guitarist and composer with a dozen albums released under his own name . He has also played on many other recordings , including those by his first group , the Hampton Grease Band .  - Music to Eat is the only album ever produced by avant garde rock band Hampton Grease Band. It was released in 1971. The album is a double album, which is apocryphally said to have been the second-lowest selling album in Columbia's history, second only to a Maharishi Mahesh Yogi yoga instructional record. This record compares with the likes of Captain Beefheart, Frank Zappa & the Mothers of Invention, and Pere Ubu.  - The Mothers of Invention were an American rock band from California that served as the backing musicians for Frank Zappa. Their work is marked by the use of sonic experimentation, innovative album art, and elaborate live shows.    After reading the paragraphs above, we are interested in knowing the entity with which 'glenn phillips' exhibits the relationship of 'occupation'. Find the answer from the choices below.  Choices: - actor  - band  - canada  - captain  - entertainment  - fan  - guitarist  - major  - musician  - singer  - songwriter
The answer is:
musician