back in the '70s, I used to be glued to Top of the Pops.
However, I always laughed when, during a guitar solo, middle 8, whatever, the camera always zoomed in on the bass player.
Volume levels in adverts? Bought a rather clever AV surround sound system (Onkyo) last year. it equalises out the volume after a while. (It samples so to ensure it doesn't turn up quiet moments in programmes, or, God forbid, music. the net effect being, and is sold on the idea of, bringing adverts down to the same level as the programmes.)