To me, while music has its mystical qualities, its pleasures, its real addictive quality is that it organizes time. Without it , it's much more difficult to perceive time in fact. It does not surprise me that our most reliable and extended scraps of memory are often related to a piece of music. If nothing else, music itself stands as a highly memorable event, and when it doubles as an associative background for a personal experience of importance-- well then you have a formula for "unforgettable."
Music stands as another tool in a Yatesian house of memory, one easily remembered and capable of distributing ideas through a time-frame so that memory can be held not only in three dimensions, but in four.