Water drums for kids

Waterdrumsssss
My 3-year-old is pretty deep into music — listening to it, playing instruments, talking about songs, etc. Sometimes it's hard to get him away from his djembe and into the bathtub. My wife found Tub Tunes Water Drums and they are a huge, er, hit with my son. The idea is simple. The plastic drums float on the surface of the water and you can vary the pitch by raising or lowering the water level inside them. The tone is pretty terrific too. They're only $15 to buy on Amazon (or you could probably make your own pretty easily). One caveat: Last night, my son said, "They work even if I'm not in the bath." Indeed.
Tub Tunes Water Drums