Pizza, French Fries. To slow down, you make your skies into a V, like a slice of pizza. To speed up, you hold them parallel, like French Fries. Pizza, French Fries.
Well, if your kid is reasonably kind, good natured, a fast learner, and flexible, one, that's one good kid, and two it should be easy to teach them anything. If not, or does not qualify for those...
First thing: Wait until your child(ren) are older than 8. When they ask "Mommy/Daddy how can I be perfect" or something that has to do with peerfection, say "People could.....if disaster wasn't...
Play lots of music in your house and car. Give them a drum or cowbell to play with, or any percussive instrument. When they sing, listen to see if they're staying in tempo or not. If you're trying to...