Go buy an MP3 player. They cost much less that what it cost to build one, such as the PJRC MP3 Player, which costs $150 (board only, need to buy other stuff) assembled and tested.
You need these things for the PJRC Player
The MP3 Player Board (pre-assembled or not assembled) - $150
Display/Pushbuttons - $42
Cable For Laptop Drive - $9
72-Pin SIMM Memory - $? (Used)
Mounting Hardware For Laptop Drive - $3
Total - $204 + SIMM Memory.
For what you get, it's not all that great. Get an iPod Mini.
Making an mp3 player
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