The concept of making kid-friendly versions of popular songs isn't new. We've all heard mediocre pop songs turned into G-rated kid songs, or, even worse, good songs turned into mush. But we recently found a collection of beautiful, instrumental lullabies that aren't campy or saccharine. Imagine if Tchaikovsky covered Jay-Z, Coolio, and Dr. Dre songs.

That's what you get when a classically trained percussionist and long-time member of the Baltimore punk rock scene grows up to have a son of his own (named Rollins!) and creates a special compilation of cover songs performed on vibraphone, marimba, xylophone, and piano. The arrangement is so sweet and innocent, like Lady Gaga meets the Sugar Plum Fairy, that it takes a while to even realize what you're hearing. It's perfect to lull a little one to sleep with a special nod to the musical tastes of mom and dad.

There are currently 3 Jammy Jams CDs available for pre-order here or at the iTunes store on October 11.

image: Jeff Bradford/Jammy Jams