Wish I knew his name but he was a bass player opening up for Supertramp in a band called Jean Luc Ponty in Toronto. Actually, the whole band kinda blew us away considering that the guy on lead played violin.
Close second would be Geddy Lee... mainly cause he can sing lead and play at the same time.

.. and the bass player/lead singer for Level 42.
Saw him in concert at MapleLeaf Gardens and he rocked.