A quote from the book ‘Love Is A Mixtape’ which rang so true to me:

It’s a fundamental human need to pass music around, and however technology evolves, the music keeps moving.

Consider from cassette tapes being copied and the rise of dual deck cassette players (and then features such as high speed dubbing) with the evolution of the mix tape. As technology has developed we’ve moved onto CD burning and then MP3s on peer-to-peer sites, unlicensed radio stations (Shoutcast etc)  and podcasting.  Developments that have evolved by the desire to share rather someone dreaming up a technology and then trying to find problems to which it can be applied.