Best vocalist ever ? Freddy Mecury, of course
Best guitarrist ever ? Pleeeaassee. The mention of Page, Gilmour , Blackmore make me laugh. They are nice players, thats all.
Hendrix, Zappa, Satriani, Petrucci, Mclaughlin and Dimeola are on a diferent level, more skilled.
Steve Howe and Jan Akkerman are tremendous players, real virtuosos of the guitar.
But by far, the best guitarrist ever is Robert fripp from King Crimson......