The CD player. And since I was in a handbell group for awhile, I guess I can say I play 1/12th of an instrument. Mostly, I sing. For about three decades I sang with local symphony chorusses, church choirs, opera groups, etc.
I've played the piano since I was 5 years old, so that is...*counts*...16 years of piano playing. I was only ever assessed up to grade 4, but I can play grade 7 or 8 with practice.
I've been playing guitar since I was 13; that's 8 years and counting. I have the most beautiful custom fender telecaster you ever did see. I also have a custom made indian guitar, and an acoustic bass guitar.
Other instruments I play but I'm crap at; I've been learning the harmonica, the sitar, and the tabla.
I also spin the wheels of steel! And write electronic music (I know some of you won't class it as music, but I disagree!)