Rockabye Baby!
My brother introduced me to this mind blowing concept last night, and I shall be eternally grateful. So shall my as yet unconceived children. Introducing Rockabye Baby!.
There are loads of albums available, 33 according to Wikipedia, from Kanye West to Tool. They say, "the series is designed for modern-music-minded parents who want to share songs like 'Paranoid Android' with their kids without scarring them for life." Brilliant.
Head over to Spotify to check out more.