Unravel the riddles of Adolphe Sax.
This is a share in the 140W January challenge . A sequel to this tale. Inspired by the life of Adolphe Sax, born in Dinant in Belgium, who actually invented the saxophone. When you search Wikipedia, you come across many of the resources I've processed. It was a wonderful man.
My chosen names that have no historical significance in this story are inspired by the readers of this series. Who knows, maybe you'll be in it too.
The photo I used comes from Pixabay: Couleur.

Marc was, of course, the saxophone player par excellence. He would play the melody that would soon open the door. But, what is the other instrument? Adolfe Sax had made more instruments? And, what was the melody that would be played. Where was the door that had to open.