I'm a little doubtful piracy is the main driving force there, until digital music became common. They charged more for CDs, and they became cheaper to make tha

I'm a little doubtful piracy is the main driving force there, until digital music became common. They charged more for CDs, and they became cheaper to make than tapes, so naturally revenue went up. Music videos, and a few super successful pop stars, greatly increased interest in pop music for a period, but that tapered off.