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This is my example for a non-computer interface.
With this design, all of the people at the party would 
be given wristbands with plus and minus buttons to 
upvote or down vote the song that is currently playing.

This interface addresses the challenges of accepting
song requests and managing the sound level of songs.
On the side, there is a list of the song requests so far
indicating how many requests a song has as well as 
if it was played already. At the bottom, is a pane
populated by the DJ of possible upcoming songs.

This interfaces addressed the problem of filtering 
inappropriate words from songs. It has an area for 
drag & dropping a song to be filtered and an area
to let the DJ download and listen to the outputted 
song.