I am writing a progressive rock song of around 10 minutes in length. For the first two minutes, I play Shostakovich's Fugue in A Major. This piece is not in public domain, so I know I have to make some changes in order for it to be considered different. So, to change it, I have changed the instrument from piano to electric piano, and added bass guitar and drums.
I'm aware that there is somewhat of a fuzzy line between what can be copyright claimed and what is safe. So, to stay on the safe side, what would I have to do to prevent myself from being copyright claimed?
I could relegate it to the background, and have sound effects be the main sound for the period of time that I have this excerpt in the music, but I would only be open to this if that was the absolute only way I could get away with it.
My main source of concern is due to the recent influx in copyright claims over songs that share a few notes in common, but seeing as this is a classical piece and not a pop song written by people who want money from baseless claims, I'm under the impression that I'd have a little wiggle room with my interpretation of the piece.