Our DS digs all the standard nursery songs, but there are some other CDs he loves, too:
Maria Muldaur has a fabulous swing album for kids called Swingin' in the Rain
I don't know who produced it, but another fave of DS's is a CD called World Party
The Roches (Maggie and Suzzy Roche) have a fun album for kids called Will You Be My Friend?
Any bluegrass, cajun, or zydeco CD (DS calls them all "hillbilly music.")
Any peppy big band CD