Well, the Tubby the Tuba book/CD from the library was enough for my son to declare that he wanted to play violin, 'trahbone' and saxophone. This was a year ago and he still talks about owning and playing these instruments. Our dear friend Kim found this gem on YouTube. It's the original animation from the 70s based on the original song from the 40s. It's 10 minutes long ... perfect amount to get some laundry in the washing machine.
It appears the YouTube link is broken but you can find it here.