Brief Medical History Overview
Shoulder issues for guitarists.
Most guitar players, sitting with the instrument on the right leg, hunch over the guitar and tend to roll the right (strumming) shoulder forward slightly. A physio and another 'expert' I've heard have said that this is bad, and the right shoulder should be kept back to avoid the scapula moving up and over.
It seems to me, however, that slumping forward and rolling the shoulder (something even technical/virtuoso players like Al Dimeola do to some degree) facilitates playing by bringing the shoulder, elbow and hand in the same vertical plane, so that the hand tracks across the strings with miniumum rotation of the upper arm in the socket. If one sits, upright and shoulders back, it puts the shoulder behind the back of the guitar instead of over the strings and actually makes it harder at the business end.
What is inherently wrong with rolling the right shoulder forward?
Here's a couple of not-phsyiologically-PC right shoulder positions for your examination..
YouTube - Al Di Meola in Kaluga jamming with Roman Miroshnichenko
It's also worth noting that John Williams - often considered the most technically correct classical player - sits in a well - twisted up position leaning to the left when playing 'Spanish style' on his right knee.
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