I use the "Rappin' Mathematician" (http://www.mathraps.com) songs for students to practice multiplication tables, but last week my CD was unavailable. My student and I made up our own rap song and rehearsed it, then performed it for her mom. She knows she can improve on it as she continues to chant it. I also really like math "wrap-ups" (http://www.learningwrapups.com) which involve still another sense in memorization.