Their songs were covered by countless artists, during the 1960s and ever since. John Lennon and Paul McCartney also gave several songs they didn't think met Beatles "standards" to other artists to record; many of those artists were later signings of Brian Epstein's. The songs were later released as a compilation album, titled The Songs Lennon and McCartney Gave Away.
ANSWER #2
I know that Michael Jackson did Come Together in the BAD album