A thread recently which covered parts being moved around to different players touched upon this practice being a breach of copyright. I've been pondering over this since, and while I accept that this could be interpreted as altering the copyright piece, I am sceptical about the definition of altering in this context. For example, taking the literal definition of altering, playing a wrong note would constitute a breach of copyright. To take the concept a step further, if the piece in question were a test piece, then unless all the bands played exactly the same, all but one, and possibly none have played it exactly as intended, and as such have breached the copyright on the piece in question. However, my understanding of this term is to stop people changing the key and claiming the piece as their own work. I would be interested to know if any bands have ever been charged of copyright theft for changing a part, and if so, just how much, or little was changed. If any band were to be in breach of copyright laws I would have thought it would be those that have videos online of them playing copyright tunes. I'm pretty sure recording of these parts whether that be a photocopy, or an audio recording would be far more enforceable, yet judging by the number of these videos around, seems to go unnoticed.