For me and my generation, music was cassette tapes. We never found the radio stations that played anything but Top 40, albums and LPs too public and, uh, not portable , and CDs too fragile. I still have a box, though my last means of playing them went when I sold my first car...
So, the idea that music can, once again (still?) from a cassette tape warms my heart like analog media reproduction. Instructable-r LoneSoulSurfer figured out how to stuff a thrift-store tape with a fully functioning MP3 player for some tunes on the go. As he says, a bit of trimming, a bit of soldering, and a bit of design work, and you're done.
A cool project to learn some of the basic skills of hacking and case modding. I likes.
Cassette Tape mp3 Player [Instructables.com]