You have a ton of options for accessing your computer’s music library from your stereo, but most require a bit of technical know-how to actually use. You can build a jukebox with a Raspberry Pi, a tiny micro-computer, that anyone can use, even if they don’t know what a Raspberry Pi is.
SolidRun Hummingboard-i2ex Dual Soc I.mx6 Dual Single Board Computer
I want one! HummingBoard: Will fit in a Raspberry Pi enclosure, runs Linux or Android, packs a bigger punch. Caution: While the pins are similar to Raspberry Pi, installing Pi hardware takes extra effort (not a direct replacement).
Raspberry Pi 2 Solid State Drive Shield Unveiled By Pi 2 Design - This allows users to add up to 1 TB of extra solid state disk (SSD) together with wireless connectivity 802.11b/g/n, as well as Dual USB offering 5V @ 1A power, RTC with Battery Backup, on-board 20W Power Supply and temperature sensor. | Geeky Gadgets