Collaborations seem to be all the rage these days - Cher is tweeting excitedly about her duet with Lady Gaga and Ed Sheeran's just announced he's going to be performing with Pink Floyd at the Olympics closing ceremony.
So which other golden-oldies have teamed up with someone a bit more modern? Who's retaining their youth and who really needs to grow up? From rockers teaming up with cabaret legends, disco stars and a dance duo and a super-slick US rapper duetting on an X Factor star's track, find out which ageing stars have teamed up with youthful music stars.
Take a look through our gallery to find out some of the maddest and baddest classic-modern combinations...
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