The APP is like a lot: there is good (and even exceptional), and less good. If this is your first approach the group, go your way, and maybe buy one of the many Best-Of available. If not, go ahead, this disc is worth visiting several times during his listening. Without being Doeuvre the leader of the group, which can be more "Eye in the Sky", "Tales of ..." or "I, Robot", it is located at the end of 70's in the best era of the training .