This is a highly technical matter and above all it depends on the country, copy right laws are different in different countries...
... in the Netherlands there has to be an equivalent of the Belgium SABAM i guess (
http://www.sabam.be/), call them, explain your situation and ask them what to do...
Yes!
On a personal note: do the work, enjoy the process, and then let it go.
Be happy - make music.
So many talented musicians I know spend more time on legal matters and "business" than the actual music. Over time, the creative energy diminishes, and their art begins to sound repetitive and uninspired.
Please, don't sell your soul for rock and roll...
Oren.