The crook goes into the first bit of the bassoon which is called the wing joint and it is called this because it has this over lapping bit here. The wing joint has your three finger holes for the left hand and the bore, the thickness of the whole, is getting um wider all the time as you go down. So it starts off quite narrow here and gets wider. And then that fits into the book joint. Now the book joint is a piece of wood that has 2 holes in it because when you play the bassoon the air travels down to the bottom and then turns round again and the bore is getting wider and wider.
And then I attach this [section] to the long joint. And then the bell goes on the end. And those are the parts of the bassoon. And this bit here is just the hand rest, which is there for comfort really.