Yoko Ono vs. Paul McCartney
This row is as old as time, and started back when Yoko appeared on the scene in the 1960s and became the famous fly in The Beatles ointment (at least by some accounts). Most recently the fight flared up when Paul McCartney (after stewing over if for 30-odd years) decided that the mega-hit 'Yesterday' was mainly his work and his name should be credited first as in McCartney-Lennon instead of the status quo Lennon-McCartney. Yoko disagreed and so this epic spat lives on.
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Photo by Getty Images May 2, 2012