Quote Sam Inglis:
I tend to agree that this is something people worry about too much. The chances of someone ripping off your song and having a big hit with it are very small. And even if it happened, and you had evidence, would you have the resources to pursue it in court?
There are certainly unscrupulous people in the music business, but if someone likes your material that much, they would have far more to gain by working with you than by stealing.
Years ago it was explained to me that if my music was good enough to steal, the thief would be far more likely to do it 'legally' via an unfair and unreasonable contract, not least because they would want to hang on to the income from any successful exploitation. And also because, whilst lots and lots of us can put a track together, the number who can make a good solid radio-friendly hook is alot less !