Get what you are owed
If you have your music on the internet, make sure you are getting what you are owed! Thats your work, and if people are listening to it you should be paid.
Make sure you copyright, become a member of ASCAP or BMI and SongExchange who will help you collect royalties for all the plays/streams of your music.
It is easy to get ripped off in this business, so make sure you are getting what you deserve.