There are 2 ways for you to earn money with music.
The 1. way is to make a beat and sell them or you can promote other peoples beats.
Here is the sites I found on this.
You start by searching for some beats, then you
get a custom player to put on your website and whenever someone clicks and buys a link from your site - you get paid!
The 2. way is to LISTEN to music and get paid, you do sometimes have to make a short review on some of the sites, but it can too be a bit of fun :-)
lets you listen to a piece of music, you write a little review and you earn a little amount of money.
Be aware: this can get a bit addictive - you may be hearing a song no one else have heard yet...
You'd listen to music and then get paid in points.