I'm amazed that it didn't sell hugely when it was released in 1967 (I suppose there was a lot of great music about then). There are very few albums I have encountered which use such a range of styles and can generate such a broad sweep of atmospheres and emotions. If you like late 60s British psycedelic rock there is nothing, as far as I'm concerned, with as much combined talent, whimsy, and where necessary, punch. I think it surpasses Tommy (its nearest rock opera rival in age and quallity)and should be regarded as one of the greatest albums of that decade. If you like Sgt. Pepper's, Pipers at the Gates of Dawn, or any of the other epoch making records of the time this is an essential buy.