A discussion of copyright evolved on the following thread about tune-suggestions for a road march: http://www.themouthpiece.com/vb/showthread.php?50461-Road-March-for-youth-band I have started this thread to avoid cluttering the other thread any more. The following are some circumstances under which bands might copy, alter or rewrite the pieces that they play: When avoiding payment for music. When correcting errors, such as wrong notes, wrong or missing time or key signatures, and wrong or missing dynamics. When omitting section(s); mostly repeats, but also other parts. When rehashing parts judged to be off-style, written below the skill level suggested by the rest of the arrangement or otherwise judged not good enough. This occurs a great deal with drumkit parts, but it is not exclusive to them. When making an unplayable piece playable; e.g. taping together single-sided sheets to eliminate impossible page-turns; bringing together parts for multiple players into a part for a single player; re-writing or altering a part where the arranger apparently does not know how the instrument works or can be played. Once again these situations are common with drumkit. When transposing to another key to, for example, suit a learner-band, reserving the revised part to the band concerned, and taking care that the band has purchased a copy of the original arrangement. I expect that there are plenty of circumstances that I haven’t included. Obviously, copying to avoid payment is indefensible, and infringes statute and contract laws. However, as someone suggested on the other thread, if it was a simple and absolute case of "just don't copy or alter anything without permission then every band would be in trouble. Bearing in mind some of the rest of the circumstances that I have outlined, I agree. Clearly, reasonableness comes into the equation in the absence of case law and waivers by publishers. However, what is the case law, what are the waivers (if any) and where does reasonableness end and culpable infringement begin? What light can people throw on all of this?