Copyleft licenses like the GPL are doing the best they can in the current world. Abolishing copyright would not harm the free software movement.

I wouldn't bother to treat music and art separately from software either. It's a shame when a game is free software but not free culture and a distro has to package it in a non-working state and ask you to separately provide some files from elsewhere.

Re-releases of proprietary games often run into issues with music licensing as well and end up removing some of the old iconic music and upsetting the players.