How do you listen to music?
To mark 40 years of the CD, we've been talking to you about how you listen to music.
The first ever CD was created exactly 40 years ago.
Although most of us probably don't use them very often these days, when they were first made, they made a massive difference to how people listened to music.
These kids have come to the Musical Museum in London to try out some different music players from history. You can find out more about the history of how we've listened to music here.