I can play the piano and the viola (and violin, I guess...but violas are better), and I sing. I tried learning to play the bass and the guitar, but my hands are too small...
I can play a piano/casio, guitar, drums, sitar, some tabla and a bit of violin. And I'm a soprano too, but my only regret is that I don't do alto well, low notes I can take some-but not all.
I play Guitar and Bass and used to be in a grunge band. I played a Fender 50s Strat and we played mostly Nirvana, some Tool, and Pixies covers. I'm glad I don't anymore, being on stage is just weird.
I play guitar and drums. It's strange because I dread taking lessons for them, I will stress about it for hours waiting for them to come over so I can get it over with. But then when I am in the lesson I really enjoy it. Strange.
Violas are awesome. In high school, we had a viola clinic and the woman who came in to work with us told us that violas were like hermaphrodites, because they go both ways. Kind of an odd thing to tell a group of high school students.
I have a drum set that I play when I get bored. I sucked at the guitar, witch is what I wanted to play, but oh well.