Greg (coughs): Yoko Ono.
Yoko Ono Lennon is a Japanese-born American musician and artist. She was married to John Lennon and is often accused by Beatles fans of breaking up the band (although many other Beatles fans argue that she did not). To this day, women who have (intentionally or not) come between high-profile musicians and their bandmates are compared to Ono, Nancy Spungen and Courtney Love being just two examples. In a 2003 interview with Ono described the disappointment she felt by the breakup of the Beatles and how it affected the lifestyle that she was used to.