in context that he was a founder member 'played with' is fine to mean he was still a member if wished you could clarify by saying 'he continued to play with them ' but it would be a bit long winded the second 'melos' bluelink is entirely optional the article isn't long enough to make it really necessary but repeat bluelinks from the intro paragraph into the main text are not uncommon and do sometimes help i can't decide if 'premiere' for the britten works should be singular or plural a footnote source for the appointments at michigan would help as this is told 'on trust' if there is more to add it would be nice to draw the sentences together a little more into two or three paragraphs but these are minutiae quite at your discretion all is well