Pig the Pub by Aaron Blabey. Published by Scholastic.
A great book about learning to share. Mallets 1 are the glockenspiels, Mallets 2 are the alto xylophones, Mallets 3 are the bass xylophones. You can always substitute instruments. I usually end up adding some other percussion instruments for sound effects. A great place would be where Pig the Pug falls - several instruments to make a crashing sound would be fun. I always teach the song first, then the instrument parts on body percussion, then put it all together. We do it numerous times over several weeks so that all students have the opportunity to rotate through all the instruments.