Musicians have unique problems having to deal with instruments held in awkward positions, sitting on uncomfortable seats, craning the head to see the conductor, and practising for hours often in cramped spaces.
Singers can, like Alexander, have problems with their voices.
Your playing produces a unique sound and, therefore, it makes sense that the better you use yourself the better your sound and the easier the music flows.
I studied to be an Alexander Technique teacher at a one-off course for Musicians only. During this three year full time course we worked with many full time professional musicians. We also worked with each other every day in a music workshop. As we were all musicians it was very exciting to see and hear radical changes in ourselves and each other.
For me, as a musician, the Alexander Technique opened up a whole new world that overflowed into my everyday living.