8. Frank Zappa
Frank Zappa absolutely loved making music, but he never cared much about selling records. The only song in his catalog that even resembles a hit is "Valley Girl," a 1982 duet with his 14-year-old daughter Moon Unit Zappa. The rest of his career was spent recording songs like "Don't Eat Yellow Snow," "Cletus Awreetus-Awrightus" and other songs that would never be enjoyed outside of his massive cult.
He wasn't even afraid to speak out against religion or censorship, even sparring with Tipper Gore and the other members of the Parents Music Resource Center in 1985. "What if the next bunch of Washington wives demands a large yellow 'J' on all material written or performed by Jews?" he said. "In order to save helpless children from exposure to concealed Zionist doctrine?" He died of prostate cancer in 1993, but he recorded countless hours of music that his growing cult will pour over for decades to come.