For your last question, not really. To see why, you have to look at the distinction between the composition and the arrangement. Jazz charts are usually just t

For your last question, not really. To see why, you have to look at the distinction between the composition and the arrangement. Jazz charts are usually just the composition. The arrangement is left up to the performers, which gives you a lot of flexibility in transposition (and instrumentation, and tempo, and feel, etc etc). Classical music is usually the composition and the arrangement. So if you transpose, you're more likely to run into problems where certain notes are no longer physically possible to play for certain instruments. Even with single-instrument classical pieces, for instance piano, compositions are very much written to be "pianistic" and fit into the piano hand in certain ways. There are definitely sections in advanced piano pieces that would far more difficult (if not impossible) to play if they were in a different key. Even with jazz piano, while a jazz pianist might be comfortable playing a standard in every key, they've got figures and riffs that they're only going to play in certain keys, because of how they're physically shaped. For a dumb example, you can't transpose a glissando from C to Db. (Dumb since a gliss is rarely appropriate.)