It is sometimes also called Art Rock. The early albums from Genesis were of this type, before Phil Collins eventually ruined them and made them into a megahit pop band.
I have a goodly prog rock collection, mixed in with a goodly blues collection, and folk, and jazz, and rock, and classical, along with a very large Bob Dylan collection. I think I have somewhere around 700 CDs. But no opera and a little bit of country. Almost no "pop" either.
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