because its a fashion
Simply 'Thumb Holes'.
If you are trying to make the thumb hole then you just sew a basic button hole (but larger of course)
Big Thumb
Thumb on the back hole and the first three holes on the front.
E on the recorder is... Your back thumb down and your first three fingers, your pointer, middle, and ring finger on the first three holes. Then your next 2 fingers on the two holes before the space with 2 holes.
You put your left thumb on the left thumb hole, and the next two top holes NOT THE REGISTER KEY OR THE A KEY
recorder
The bassoon has the most keys out of any instrument. It has 9 keys for the left thumb alone, 4 for the right thumb, 4 keys and 2 holes for the left hand and 6 keys and 2 holes for the right hand. This makes a total of 23 keys and 4 holes.
Put two fingers on two holes and cover the hole on the other side with your thumb.
yes
recorder
the thumb is where Stanleys great great grandfather found water when he was there