[icarus_drowning]

You'll find that listening to music in a single key for extended periods of time can become extremely tiring. Most (not all people) need fresh tonality, or they get bored. (Obviously all of this depends on what kind/style of music you are listening to, etc., but I would wager that even if you switched from "classical" music to "pop" music and stayed in the same key, most people would find it aurally tiring).