in b4 shredders...
too late.
It's hard for me to reconcile very technical guitarists, or other instrumentalists, from being the BEST musicians, if they write really bad music.
For example, Guthrie Govan is one of the most technically amazing guitar players I have ever heard. If you listen to his songs, though, they are very boring. Painfully boring. The chord progressions and sense of melody seems like it was created on MIDI for an 8-bit video game.
That can go for any metal/shred band.
In contrast, even technical jazz, like bebop- those guys still had melodies that were interesting or pretty. Someone like Charlie Parker could out-play everyone technically, but still had amazing, beautiful tone, and they were playing over much denser harmonic structures.
A lot of classical guitar players play cello very well, but that's such a niche market, that I won't compare an art musician to a pop one.
Prince does seem like a logical choice for best musician, if you take into account versatility, technical ability, and songwriting.