How to get signed?

[picato]

Not because I'm planning to become signed by my self for the moment, but I'm just interested in how peolple do it. Especially these days when most music sounds pretty the same and there are more than enough people with their own home studios. Do they just send their demos to record companies or what? Also interesting is that most peolpe making pro dance music and gets signed seemes to be DJs, how come?