If you think all pop songs sound the same, you're in good company. Pop superstar Ed Sheeran took the stand in court this week to defend himself against allegations he copied Marvin Gaye's 'Let's Get It On."
Sheeran argued most pop songs use the same three or four chords, and no musician owns them.
But if that's the case, why are so many pop stars being taken to court over the past few years?
RNZ Music 101 presenter Charlotte Ryan spoke to Charlotte Cook.
