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1.
The bass guitar player and lead singer for the 60's rock band Cream. He is concidered to be one of the greatest bassests who ever lived, and to have one of the most original voices ever. Bruce originally played a Gibson SG style bass.
Jack Bruce can sing like no other!
by John Underwood May 18, 2005
 
2.
Bassist and vocalist for Cream. He is a mediocre musician and he is also a dick. He called Led Zeppelin "crap" and started bitching about their reunion tour. Also a cranky old man filled with jealousy.
Greg: Psh, Dan sucks at playing guitar
Dave: He's better than you. Stop being such a Jack Bruce.
by Page218 May 05, 2009