I admit it: I'm a solid fan of the Beastie Boys, and it's extremely sad to report that Adam Yauch - MCA - died yesterday after battling cancer for almost 3 years. I was hoping to dig up a photo of him with a pet. That didn't happen, but in the process here's some fun things I did find:
50 pictures of musicians their pets, from Pigeons&Plans. Great snap of John Lennon nuzzling a Siamese, and Paul McCartney and Martha of "Martha My Dear" fame.
Billboard has some of the same shots in their Pop Pets: Musicians and their Furry Friends, but look anyway if only to see Cee-lo's awesome cat.
You like perhaps something more traditional? Then Yale Libraries has something for you: Musicians and Their Pets, in which you may see Benny Goodman with his kids and fuzzy dog, among other great photos.
By the way, one of my favorite cats-in-music video is the one scooting now and then through the Beasties' "Looking Down the Barrel of a Gun."