It is a problem or blessing sometimes trying to learn classical pieces by ear from bona fide, period instrument, Early Music ensembles, or trying to play along with such an ensemble's recorded work having learned the work from print. I whacked away at the well known bouree from Handel's Water Music from the horn part sent to me by a friend, and when I got it on mandolin to to my near satisfaction I tried to play it along with a fine recording I had always liked and- the written music in F sounded in E! Damn! A-415, I guess. A pretty convincing exact half tone low. Oh well, doesn't happen often to ear-preference folkie types, does it!
Carter B