Quarterflash
Songs: Find Another Fool - Harden My Heart

Suzi Quatro
Susan Kay Quatrocchio
Songs: Stumblin' In (& Chris Norman) - Devil Gate Drive - If You Can't Give Me Love - She's in Love With You - Can The Can

Queen
Freddie Mercury, Brian May, Roger Taylor & John Deacon

See also: We Will Rock You (musical)
Songs: Crazy Little Thing Called Love - Don't Stop Me Now - Bohemian Rhapsody - We Are The Champions - Love of My Life

Queen Latifah
Songs: When You're Good to Mama (Chicago (film)) - I Know Where I've Been (Hairspray (2007 film)) - As Time Goes By (& Rod Stewart) - U.N.I.T.Y.

Queens of the Stone Age
Josh Homme, Troy Van Leeuwen, Joey Castillo, Dean Fertita & Michael Shuman
See also: Mark Lanegan
Songs: Make It wit Chu - No One Knows - Little Sister - Go with the Flow - 3's & 7's

Queensrÿche
Songs: The Lady Wore Black - Anybody Listening? - Silent Lucidity - Empire - Queen of the Reich