Teach students how to count 1-20 billion. This song is so easy, but it get's to be a challenge near the end of the song. It's good for all levels and all ages whereby it's set to three levels first is the easiest and the third is the most difficult. The third level is repeated three times to give students a chance to practice the fastest speed. I think students can have a lot of fun with this song. I reward those students who succeed at saying the words close to the speed of Excellent speaker.