Well, it's very difficult for me to say a word about it.
I was in 1979 the director of the Original Spanish Cast of HAIR in a pre-democratic era. For me Hair was the first "new" musical. The history of musicals are after and before Hair very different, the concept of what a musical must be, more than this, what theatre must be radically changed.
The music is really wonderfull with songs who was flags of a generation and a hundred versions of it (do you remenber Oliver's Good morning starshine?)
What more can I say? Go hurry, buy it and trausure it like a diamond,for many reasons (not only musicals) it's one of the five best ever.
I select this version because I dislike the Original soundtrack of the film a lot (Well, I hate the film too),and the Original London Cast don't have Rado and Ragni singing in it.
I have all of them , but if you must choose only one, this is the one to spend the money.
Don't you believe me? Well,explain me the success of RENT if HAIR never.......