I've recorded another variant of theis song on my childrens' CD - Seamus Kennedy Gets On Everybody's Nerves,which I learned in Ireland many years ago. I also get the kids to act out playing the instruments, accordion, trombone, fiddle, tuba, bagpipes, etc. There's one bit of silliness in the last verse: a lawn-sprinkler.
I think this was originally an old German
folk song, and I used to sing it years ago with
friends at parties. The insruments here are only
a quarter of the ones we would do. You can add
your own intstruments to the list. They don't
have to be MUSICAL instruments, you know.
I mean there's a Lawn Sprinkler in this one!
Thanks to my friend Ed Miller for bringing
it back to my memory.

THE MUSIC MAN    (Trad.)

I am the music man, and I can play,
What can you play?
(Repeat after each verse)

I can play the accordion:
In and in and in and out, in and out, in and out.
In and in and in and out, in and in and out.

The trombone: Back and back and back and forth, etc..

The fiddle: Up and up and up and down, etc.

The tuba: Oom-pah, oom-pah, oom-pah-pah, etc.,

The bagpipes: Huff and huff and huff and puff, etc.,

The snare -drum: Rat-a-tat-a-tat-a-tat, etc

The piano: The pia-, pia-, pia-no, etc.,

The lawn sprinkler: Tsch, tsch, tsch, tsch, tsch, etc.