[senko]

> > DJ's should be paying for the music they're playing.

They are, separately from obtaining the material. Look up "performing rights" (which is specifically for songs; it's analogous for recordings, can't remember the exact name now).

> Also, using .mp3 as DJ is unwritten crime.

I would like to meet the person who can hear problems with well-encoded 320kbps mp3 when played in a crowded and noisy club.

[charcircuit]

The venue is responsible for acquiring performance rights. Not the DJ.

[senko]

Authors get paid. The point stands, unless you want to argue that both the venue and the DJ should pay.