How do I know if a piece of music is in copyright?

In the UK a piece of music is usually in copyright for until 70 years after year of the composer’s death. It is important to note that copyright relates to re-arrangements and collections too. So if the composer of a piece has been dead for 150 years but you are using a re-arranged edition and the re-arranger is alive, or has been dead for less than 70 years, it is in copyright. You can find out more in our full PRS guidance