"Bonjour, Monsieur" from Matt Maxwell's book "Let's Sing and Learn in French"--a short song introducing body parts via the expression "J'ai mal a." The simple video provides clear illustrations of the key vocabulary with onscreen lyrics.
Les Couleurs - great song to teach colours in French, but also to use as a brain break. I play it for grade class and have them jump up everytime they sing a colour that they are wearing. They constantly ask for the colour song!