HT0996 - Perennial Favorites

Each one of us have certain pieces of artwork that we return to over and over again, year after year, perhaps even decade after decade. I can't remember the last time I played an album by Bread (once one of my favorites), but I listen to Kind of Blue by Miles Davis at least once a month, and have for 30 years since I first heard it. What makes that elusive character of artwork that gives it longevity?