Depends on the age of the kids. Bedtime songs for young kids can be just about anything that is melodious and non-threatening -- I used to sing my son "Sweet Baby James" at bedtime. If you want to be more interactive, in the 2-6 year old range, songs like "Bingo" (B-I-N-G-O and Bingo was his name-o) work well. Or you can take any song and plug in the kid's name, and they love it -- for my son, "little Jackie Paper" became "little Michael Paper", "Johhny B. Goode" was "Michael B' Goode," etc., and suddenly the songs were about him). For school-age kids, I remember an acquaintance of mine years ago playing some of Shel Silverstein's poems set to music. I never knew if Shel had turned them into songs, or if my friend had done it on his own, but they were great fun -- "Sarah Cynthia Sylvia Stout Would Not Take The Garbage Out," "Hungry Mungry," stuff like that.