I found an interesting little website
http://www.babyrockrecords.com/web/page.aspThey do lullaby versions of songs from artists like Radiohead, Metallica, Coldplay, Tool, Pink Floyd, the Beach Boys, the Cure, Nirvana, Led Zeppelin, Queens of the Stone-age, the Eagles, U2, the Ramones, and NIN! Surprisingly, these lullabies are pretty well done. You can listen to 30 second snippets of the song, too.
I also enjoyed this one paragraph on the NIN page.
"Trent Reznor uses unique sounds to create electronic music that is otherworldly. His songs are a warm place that are closer to being fragile than broken. If your child bites the hand that feeds, play this album. It is made with all the love in the world."