Not sure if this is what you're looking for, but 'Quiet Time' by Raffi is one of my fav's.
We also liked the 'Rockabye Baby!' series featuring modern artists tunes done like lullabies... Nirvana, Coldplay, Metallica and there's a few others.
Edit: Theres a whole lot more in that series than I remembered... check them out
http://www.rockabyebabymusic.com/web...p?pgs=products