The Pout-Pout Fish Far, Far from Home. By Deborah Diesen. Published by Farrar, Strauss and Giroux.
My students love the Pout Pout Fish and here's another great one about traveling.
Mallets 1 are the glockenspiel, Mallets 2 are the xylophones, Mallets 3 are the bass xylophones. You can always substitute. You can also add sound effects for the story, such as the ocean drum. I teach the song first, then the instrument parts on body percussion, then put it all together.