Aliens in Underpants Save the World by Claire Freedman and Ben Cort
My students love the "underpants" books. I added instruments with this one and usually use it in 2nd grade.
Mallets 1 - glockenspiel
Mallets 2 - alto xylophone
Mallets 3 - bass xylophone
percussion 1 - something that sounds funny like the vibraslap or
percussion 2 - either vibraslap, flexatone, or triangle
percussion 3 - gong or cymbal
If you don't have Orff instruments, you could make it fit with Bookwackers, and other percussion.