1. March 16, 1970: Marvin Gaye's duet partner: Tammi Terrell
2. September 18, 1970: His picture is in the Smithsonian Institution for his famous performance of "The Star Spangled Banner" at Woodstock: Jimi Hendrix
3. October 4, 1970: Female rock/blues singer famous for "Piece Of My Heart": Janis Joplin
4. April 6, 1971: "The Rite of Spring" composer: Igor Stravinsky
5. July 3, 1971: Lead singer and songwriter of The Doors: Jim Morrison
6. July 6, 1971: New Orleans' airport is named for this jazz pioneer: Louis Armstrong
7. October 29, 1971: Founder of a Southern rock band with his brother Greg: Duane Allman
8. January 1, 1972: French singer and actor famous for "Thank Heaven For Little Girls": Maurice Chevalier
9. January 27, 1972: Pioneering female gospel singer based in Chicago: Mahalia Jackson
10. November 11, 1972: Bassist for the band mentioned in Question 7: Berry Oakley
11. March 8, 1973: The Grateful Dead's original keyboard player: Pigpen McKernan
12. September 20, 1973: He created Leroy Brown, Big Jim Walker and Willie McCoy: Jim Croce
13. October 22, 1973: Spanish Catalan cellist who played at the Kennedy White House: Pablo Casals
14. December 20, 1973: His hits included "Mack the Knife" and "Beyond The Sea": Bobby Darin
15. May 24, 1974: Jazz composer who appeared on the Washington, DC state quarter this year: Duke Ellington
16. July 29, 1974: One of the Mamas: Mama Cass Elliot
17. November 25, 1974: "Pink Moon" folk singer who became more famous after his death: Nick Drake

Bonus: January 16, 1972: Voice of Alvin, Simon, and Theodore: David Seville