[patrickk]

How about iterating on your idea?

Here's an idea of mine for free (I came up with this as I was reading your comment, so feel free to critique it):

Instead of uploading a text file, a user can type in an artist and song title on their smartphone. This gets added to a playlist that's displaying on a large monitor/TV/projector screen. This could pick songs from YouTube/iTunes/Winamp etc.

Uses:

- Nightclubs. People can offer track selections for the DJ. These are displayed on the wall. Or maybe there is no DJ at all. Users can vote on their track choice that are coming up next on the screen, as well as offering their own track pick - like HN voting/article submissions. (This would be the geekiest nightclub of all time.)

- House parties. As above.

[miguelpais]

Once I thought of something like that too, but in the environment of a park with speakers and wifi (yeah, far fetched, I know). People could go to a website available on the wireless network with their smartphones and pick a track to play (from a library such as Spotify). Then everybody on the park would be able to up or down the track using their smartphones. If the track had enough up votes, that person would be able to pick another track to play.

It would be the interactive/social/sound park. :P

But since I don't know that many parks with speakers, on clubs it would probably work better. They could do it as an experiment on a tent of some festival like they did with the concept of the silent disco (http://en.wikipedia.org/wiki/Silent_disco).

[nasht]

I am totally into this idea and I'm looking right now (experienced javascript, python, java + MBA). If anyone is serious about doing this, let me know. I can code and raise cash.

[resdirector]

I was thinking of building something like this, too.

I was going to start in cafes, and monetize by charging the cafe for the service. The patrons get the jukebox-ey service for free, and the cafe pays a small monthly subscription.

[bekirdag]

it needs a serious development time (and probably investment cause you will need hardware, space and time) but i think this could be the future of public music.