Try listening to some music with your friends. Choose a different 'instrument' each, and see if you can each hum the sound that the instrument makes: soon you'll be all singing in harmony (ish!). Can you identify the different parts that make up the piece of music? Most pieces of music will use a number of different instruments. Find out more in Sorted!.

There are also LOADS of different kinds of music - check out What's Your Type?