Education and stamps: Sliding Puzzle Organ

Move the pieces until the stamp can be seen correctly..
On the stamp you can see the composer and organist Paul Hofhaymer playing a table organ. Because this organ is so small and light that you can carry it, those organs also are called ‘Portativ’ (which comes from the Latin word ‘portare’ = ‘carry’). However, there is a crucial error on the stamp: as long as nobody operates the bellows, the organist will not be able to produce any sound.