While making dinner I was listening to a little Django Reinhardt (1910-1953) and suddenly thought a) there must be a stamp, and b) he might be added to this thread.
He's shown on this French stamp of 1993.
Reinhardt was born in Belgium to a Romani family, but made his career in France. When he was 18, he was already a good guitar player, but he was horribly burned over half his body in a nighttime fire in his caravan. After a long recovery, the third and fourth fingers of his left hand were left twisted and useless. He relearned his chord work and went on to become one of the most influential and fast jazz guitarists ever using just two fingers on the frets.
You can see on the stamp his hand is not positioned as one might expect. A photograph of him is below which shows things more clearly. Also shows his ever-present cigarette which is omitted from the stamp.