Octavio Paz

Music would lose its charm were not dissonance interspersed at frequent intervals. The closer a composer can come to discord without actually entering it in the score, the more pleasing will be his composition when given life through musical instruments.

What I look for when I see a piece of art for the first time is some kind of emotional, intellectual experience, that's a combination of both of those things and is informed by my knowledge and something new that I see the artist doing.