best multi-instrumentalists

Wow, thanks...

I submit Robin Williamson of the Incredible String Band! And add votes
for Prince, Stevie Wonder and Ian Anderson. And the Shulman Brothers
of course.

Bob Drake plays bass, drums, keyboards, violin, mixes, masters etc.,
Lindsay Cooper, all reeds and keyboards, Fred Frith (obvious), Hugh
Hopper (bass, guitar & keyboards), Amy Denio, Dave Kerman (drums,
keyboards, bass and guitar), Tchad Blake, David Hidalgo (guitar,
accordion, bass, percussion), the list goes on!