If you’ve got an old GameBoy laying around, why not interface it to play CDs using an ATAPI CD-ROM drive from a computer. Video clip after the jump.
Here is what you need to build your own: A GameBoy to show track information and control the playing. A GameBoy cartridge: we will need it to interface the GameBoy to a board. An ATAPI drive to play the CD. A 12v-5v power supply.