When do actual noises become part of a melody? Does music exist simply because we hear a succession of tones, singly, or clusters of tones called chords? In my opinion, this is not so, if we did hear music as a succession of tones and chords then, we wouldn't hear music at all. We would hear a succession of noises. The actual perception of music is the perception of the intervals between the tones, even though you may not realize it, and even though these particular intervals are not intervals of silence but "steps" of varying length between points on the musical scale. For example, Tone Deaf people only hear noises because, they simply can't perceive the intervals between tones. These steps or intervals are auditory spaces, as distinct from distance-spaces between bodies or time-spaces between events. So good music only requires two things; the right patterns and a mind to interpret those patterns successfully.