If you think your copyright has been infringed, you will usually need advice from a lawyer about your chances of success in a legal action and what steps you should take. You need to be able to prove that the other work is the same as, or reproduces a “substantial part”, of your music. You also need to be able to show that the similarity results from actual copying of your music (not just coincidence). For more information, see our information sheet Infringement: what can I do?