Aliens Love Underpants by Claire Freedman and Ben Cort
My students love the "underpants" books. I added instruments to this one and usually use it in 2nd grade. If you don't have Orff instruments, it will work with Boomwackers and/or other percussion instruments
Mallets 1 - Glockenspiels
Mallets 2 - Alto Xylophones
Mallets 3 - Bass Xylophones
You can add some funny sounding percussion (like vibraslaps) and something ringing like triangles at the words "aliens" and "underpants"