A quote from guitarist Johnny Marr (The Smiths, Electronic, Modest Mouse, The Cribs, and on and on):
“I was a kid whoused to walk around all day wearing invisible headphones. If it was a record Iheard before going out to school, it would affect the way I would feel andbehave all day.”
I think that was very true of me as well. But it could be maddening. It would drive me crazy having a song go through my head as I took a test. But I believe he is referring more to mood, and it’s true that music can add a spring in your step at times, but also make you somewhat depressed. It always affects my mood.