We have piano, drums, and voice. Experimented a little with guitar, but not seriously. Piano because everyone should play the piano wink. Drums because better you hit something that sounds nice than the furniture and walls. Voice because you can't stop them from singing.

I love the sound of the cello, too, though I couldn't persuade any of ours to take it up.

And personally, I think there is no sound worse than a bad oboist!

...pronounced like the long vowel and first letter of the alphabet...