John Lennon: Instant Karma (1970)

"Instant Karma" was the first solo record by a Beatle to sell a million copies. Lennon’s solo work actually competed with his band on the charts. "Let It Be" also reached the top 5 in 1970. Phil Specter produced the Lennon hit, which took 10 days to record and release. Two months later, the Beatles split.

http://www.youtube.com/watch?v=EqP3wT5lpa4