S.M.
We listen to a CD called "Songs for WiggleWorms". I downloaded it to my IPOD and my DD ( 14 mos) absolutely loves it. We listen to that CD everyday (in the car, in the kitchen, in the playroom) and my daughter is learning to act out a lot of the songs now. It really is so much fun.
We also really like Elizabeth Mitchell's music. I have given most of my friends her CDs as gifts and I have always received wonderful feedback.
If you have ITunes...it is a great place to sample various songs and artists. I couldn't live without it. Just type in 'toddler music' in the search window and see where it leads you.
Good luck.
S.