Astral Weeks by Van Morrison. Don't be put off if all you know of Van is his later, middle of the road, celtic soul stuff. This album, his second solo effort, is unique, haunting, and has the power to enchant you for many, many years. Like all great records, you won't out grow it, rather it's meaning will change as you do. Recorded in just 3 sessions in the space of 20 days it sounds like no other album before or since, it's genuinely mind-boggling that he recorded an album of this emotional depth and complexity at the tender age of 23.