Make:

Matthew Irvine Brown's "Breath Control Car" project - " This is a standard remote control toy car with a mouthpiece the player blows into to control steering. The car measures controlled change - blow gradually harder and it steers to the right; blow gradually softer and it steers to the left. At least 80% of the technique of singing or playing any wind instrument is concerned with controlled breathing. This toy replicates many traditional breathing excercises in a context of play, whilst preserving the ethos of 'practice makes perfect' - providing clear goals and requiring a degree of mastery through repeated practice. " [via] - Link.