Re: What song lyrics describe the rock and roll industry?
Classic example is Free Man In Paris by Joni Mitchell (et al) which I believe was sparked by some comments from David Geffen about him being away from the music rat race while on a trip to Paris.
Only A Northern Song by The Beatles was basically about having to crank out an extra song for that album (their publishing company was Northern Songs... hence "it's only a Northern song...")
Just Another Town by Flo & Eddie is a very poignant song about touring.
I'm sure there are dozens of other obvious and not so obvious examples.