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 and SongExchange who can find all the places your music is being played and collect royalties for all of it.
It is easy to get ripped off in this business, so make sure you are getting what you deserve.