Wow, lots of replies and no guitarists, I don't think I've ever seen that happen before. 
I play flute and clarinet and sing. I used to play piano and violin. I've been in the band, the jazz band, the orchestra, and the choir. I'm currently in choir. I did try guitar once, but found it wasn't my thing. Nearly everyone in my family plays an instrument. My parents got me into music.
For singing: anything but pop music
Flute and clarinet and everything else: anything really (unless it's really really slow. I hate having to play slow because most of the songs are fast and I'm used to that. )
Woo, fellow choir guy right here! Mind you that was over 16 years ago now... probably not so great a singer these days!
I play the violin, baroque, classical, romantic
Good stuff, you've got quite a catalogue of tunes to choose from as well. Have you ever thought about giving it a go on a viola or cello? Similar skillset, but generally a much different role.
I'm a cellist -- though I haven't had too much time to play recently, with my college not offering a music program. I also took advanced music theory for a year and that was kind of one of the worst years of my life, haha.
I still dream of parallel fifths sometimes, and shudder.
My parents were big on making sure their kids all played instruments, and they kind of chose mine for me when I was in middle school. I've taken years of tutoring since then and grown to really enjoy it!
I've played all kinds of pieces, though I do favor things from the romantic period.
I'll probably get really into it again within a month -- my fingers have been itching for a good session with my cello for a while now; I just have to get it from home to my dorm.
Love cellos, they are haunting but beautiful sounding instruments. My parents never played much music, but they did get me the guitar that I got started out on. I wish my grandfather had of lived longer, he was apparently a master on the guitar and mandolin.
Me! 
(you'd think so because of my name haha)
I currently hold all the piano performance diplomas (ARCT & LRCM) from the RCM Conservatory in Canada, as well as a Pedagogy dipoma. I also play a Chinese instrument known as the pipa, and I've completed all of the exam levels. I competed internationally in China last summer and got Bronze. 
I also play the tenor sax, various percussion instruments, and the oboe.
I'm OBSESSED with romantic music - especially Chopin hehe. 
Very cool, congrats on the bronze medal! How rigourous of a training schedule did you have to have in order to get to where you are now? Awesome with the sax playing as well. My lady hasn't played recently but I've been really trying to get her back into it. I'd love to have a sax player to jam with.
I used to play clarinet for my high school band, but now I don't really have time to play an instrument (university is busy) 
I could probably still play some of the simpler songs though.
Hopefully you'll find some time to pick it back up. Music's an excellent way to relax and get in touch with yourself.
I'm prominently a Pianist at heart, love to sing along to songs of all sorts of genres but I think it'd be a couple days re-acquaintance with a Trumpet, Trombone, Cello and Violin if I were to start playing them again. I'll edit this again later with a pic of my simple but still amazing Electric Keyboard. Should invest into a Cello again because I miss it the most but I don't think I'd be able to afford it for quite some time...
Piano was always a fun instrument to jam around on. Understanding intervals is huge for it as well, since everything is laid out in a lovely straight line.
Bass peddle sounds like a .50 cal machine gun they're so fast. There are a ton of great drummers. Man can only dream to be that epic.
