Love it...

Nothing sounds better than children giggling.

I gave the pixie an empty dishwasher tab can, one with a metal bottom.  She's banging it on everything.

I put a small handful of black beans (the only kind I've got) in an empty Nesquick can, and gave that to the imp. He's drumming on the end sometimes, and shaking it others.

"Both make music!  Get drum, get rattle, make music!"

Giggle, giggle, giggle.