Watch Elodie Harper's video report below:
Now if you ever wondered what a room full of 200 harmonicas playing sounds like, there was a chance to find out today.
A giant music lesson took place at Cambridge's Corn Exchange as part of a national programme to get more of us playing a musical.
Steve Lockwood has written for Tom Jones and played with the London Philharmonic, but today he was teaching a free music lesson to around 250 people at Cambridge's Corn Exchange.
Free harmonicas were handed out at the door, and Steve guided the crowd through the basics - including the opening bars of Leonard Cohen's Hallelujia