I've been transcribing music on and off for a few years now as a hobby and noticed while reading someone else's sheets that they have heaps of clef changes midway through the piece. It sort of blew my mind a little that you could even do that.
My question is when and why use a clef change over an 8va? Is there some sort of convention I haven't heard about? Some sort of debate or war ongoing between Octavians and Clefians because of this question?
My understanding was that clef changes should only be used if the octave change spans like a third of the piece.