Too many to choose just 1! California Love, No Diggity, Hypnotize are all faves. (though Hypnotize is not Puffy, I don't think.) I also love "You Can Do It" by Ice Cube. My 3-year-old daughter does too, because that's our potty motivation song. (as in, if she's having trouble pooping, I'll say "you can do it, get your back into it" and then she starts wiggling her little butt around and singing along.)