Lyrics to "Ah ! Vous dirai-je, Maman" are HERE, HERE, and at many other sites. Mozart composed "12 Variations on 'Ah vous dirai-je, maman'"; the score is HERE. Hungarian-born Dohonanyi also composed Variations on a Nursery Song, using this melody in 1913 (Click here (pdf file) for information, with lyrics & brief song history).

~Masato