Frank Vincent Zappa was an American composer, guitarist, singer, film director, and satirist. In his 33-year musical career, Zappa proved to be one of the most prolific musician-composers of his era, releasing over sixty albums during his lifetime, almost all of which consisted of original compositions. He was also a renowned electric guitarist and a gifted producer-engineer with an encyclopedic knowledge of studio technology, who self-produced almost every recording he made after his 1966 debut. His work spanned virtually every contemporary musical genre (including avant-garde, big band, blues, contemporary classical, doo-wop, electronic music, funk, hard rock, jazz, jazz fusion, country, musique concrète, pop, proto punk, Punk Rock, progressive rock, proto-rap, reggae, rock, ska, and world music), and was often noted for its blend of high art, rock opera, absurdity, scatological humour, and for its caustic satire. Zappa has a large and fiercely dedicated worldwide following, particularly in the United States, the United Kingdom, Italy, Germany, The Netherlands and Scandinavian countries. His albums were a strong influence on other groups, and his critically acclaimed work garnered brief mainstream success in the late 1970s and early 1980s, with the hit singles: "Don't Eat The Yellow Snow", "Dancin' Fool" and "Valley Girl". Zappa, as demonstrated by his disparaging comments about the music business, never cared much for mainstream acclaim. Zappa was married twice, once to Kathryn "Kay" Sherman (1960–1964; no children), and then in 1967 to Adelaide Gail Sloatman, with whom he remained until his death. They had four children: Moon Unit, Dweezil (born Ian Donald Calvin Euclid Zappa, because the hospital refused to put Dweezil on the birth certificate; Dweezil later legally changed his name to "Dweezil"). Frank Zappa died on December 4, 1993, age 52 of prostate cancer, and was interred in the Westwood Village Memorial Park Cemetery in Westwood, California. His grave is unmarked, although its location is known among fans and can be found on the Internet.