Lenny Kravitz
(Yes, I realize that the picture to the left isn't Lenny Kravitz, but I did an image search for Lenny Kravitz, and this guy came up.  The question is not "How can you post this picture?" but rather "How can you not post this picture?".)

How we know him:  Lenny Kravitz is a very talented singer/songwriter who has had a successful solo career in addition to writing for and working with Madonna, Aerosmith and the ever popular Baha Men.

How Jewish is he?:  Kravitz is known to plays all the guitar, bass, drums, keyboards, and percussion himself when recording.

Great Jewish moments in his career:  Kravitz appeared with actor Dustin Hoffman in Germany to sing the lullaby You Are My Sunshine.
Slash


How we know him: Slash is one of the most famous guitar players of our day.  He is known for his sometimes overuse of the Crybaby Wah pedal.  He has been in Guns N' Roses, Velvet Revolver and of course Slash's Snakepit.

How Jewish is he?:  Real name is Saul Hudson.  He is half Jewish.  The other half is black.  As a fun fact, his mother designed some of David Bowie's outfits.  Wikipedia, what would we do without you?

Great Jewish moments in his career:  Does working with Daughtry count as a great moment?