At various times I've played recorder, piano, pipe organ, violin, viola, voicebox. I've also tried my hand at flute and trumpet, but not to the point of being able to hit a note. :(

Having done little of any of the above for many years, singing and piano are the only ones at which I'd expect to have retained any proficiency. My one professional engagement was to sing a selection of songs by Tom Lehrer, and Flanders & Swann: payment, my ticket to the May Ball I was singing at.