Paul McCartney

"We saw that everyone sort of has a signature model, and to Paul it didn’t really seem that important," said McCartney's technical manager, Keith Smith.

"I loved that kind of stuff and so I wanted a guitar that was going to give me feedback, as none of the others could," Macca said.

Though the Fab Four certainly weren't known for dissonance, dabbling in it helped power one of their most dazzling and influential early hits.