There are a lot of highly enjoyable reads on music and the music industry. Austerlitz's history of the music video is a must-read; Simon Reynolds' Retromania puts together a strong argument on the changing nature of the audience for music, and Ralph Negus has done a fantastic overview of academic theory around music and audiences.
Whichever artist you're working on, you will be able to find books on them, their influences, their genre which help throw up ideas. As a result of so frequently name-checking Madonna when discussing Lady Gaga through the 2015 A2 Bad Romance production, I tracked down the hefty bio on her, a great read, and reinforcing the view that the likes of Gaga 'borrow' hugely from the Madonna playbook.
Witt's book, just out, I haven't read yet, but covers the span of two decades in which a bloated music industry exploited digital technology to charge fans to re-purchase music many already owned on vinyl or cassette. This hubris would come back to bite them as digital piracy took off, an early indicator that the traditional passive producer-audience relationship was unstable and set for disruption under what would become web 2.0...
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