I want a copy too! Here are some lullabies I like:

All Through the Night
Baloo My Boy
Brahms Lullaby
Can Ye Sew Cushions
Evening Prayer
Hush Little Baby
Irish Lullaby (Too-Ra-Loo-Ra-Loo-Ral)
The Riddle Song
Rock-A-Bye-Baby
Summertime
Suo Gan (Welsh Lullaby)

The Riddle Song is perfect for two voices.