Like strad, I can find not seeing a musicians hands annoying. Sometimes it seems to work along these sort of lines: you get full shot of a guitar player strumming some chords. He goes into some solo bit where it might be useful to see the hands in a bit more detail so they zoom to give a close up of the player's sweating forehead...

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I've noticed the advert sound problem with some films. I watched one the other night where short of constantly changing the volume, the choice was struggle to hear the dialogue avoid the music being too loud or put up with the loud music to hear the dialogue clearly.