Oh boy can I ever agree with you. The catch is that with older music recordings are not always available. And when others transcribe for an instrument an unholy mess can result. In particular a show tune may have melodies split between the right and left hand of a pianist or between several instruments. Even a beat in the counter melody may serve as a beat in the melody. When that type of work gets transcribed it has to be by someone who actually plays the instrument. I don't want to insult any publishers but I have seen stand alone solos that are absolute trash. Those guys can take a wonderful tune and turn it into a nightmare The time it takes to really transcribe a melody from some of the great tunes can be excessive. Also the notations used by some publishers are nothing like a real bandsman is used to at all. Many of the publishers seem to avoid any mention of the classic Italian notations at all, ever. God forbid they should ever give recommended beats per minute. By the way, the one benefit of learning Sousaphone is that because of the length of tubing the Sousaphone must lead the beat in order for the sound to arrive on time. Band directors batons often are only following the sousaphone which is actually setting the pace for the music. Having spent some years on the sousaphone I know that we were usually anticipating the meter of a bass drum or even a snare drum. Those guys hold time so it gets easy for the Sousaphone to arrive just as the drum sounds and the conductor falls right in line.