Other than being able to optimally enjoy music, which is number one reason, I am sensitive to and therefore agitated by unnatural sounding music - too heavy bass, sloppy or fuzzy bass, muffled mids, zingy or tizzy highs, cymbals that don't sound like brass, ringing piano, etc. When I hear music, even if it is faint, my brain will focus on it and I cannot ignore it. There is no such thing as background music for me - its all foreground, regardless of content or volume. Therefore, when I wish to listen to music I want it to be as real and natural as possible. Needs high(er) end gear to accomplish this.