Practically, this wouldn't really work unless you went deaf. In which case it would affect a lot more than music habits. I suppose one could also lose tonal perception but that would still cause other problems.
Even with no recorded music, nothing stopping you from humming a tune or hearing it in your head.
At this time, I'm not so sure I would accept that deal from whatever crossroads demon is offering.

But from my vantage point, those last three years would most likely be in old age and could be fraught with suffering. Suffering that would really only be alleviated by things like MUSIC. Not to mention, a lot of the people that matter now (namely my parents, some of my friends) might not be around anymore. At this point, I have friends but none so close that I would stay alive through the hell that is often the last few years of one's life to just to be with. And I know not of love yet but.... if I ever meet that special someone and they feel the same way back, well, that might change the game completely.
...yeah, I took this way too seriously.

P.S. Why no regular laughing smiley?