Recalling "Revolver"s release in his book "Revolution in the Head", Ian MacDonald says that the Beatles "initiated a second pop revolution – one which while galvanising their existing rivals and inspiring many new ones, left all of them far behind". In a February 1967 review, "Hit Parader" declared: ""Revolver" represents the pinnacle of pop music. No group has been as consistently creative as the Beatles, though the Spoonful and Beach Boys are coming closer all the time ... Rather than analyze the music we just suggest that you listen to "Revolver" three or four times a day and marvel ..." Later that year, in "Esquire", Robert Christgau said the album was "twice as good and four times as startling as "Rubber Soul", with sound effects, Oriental drones, jazz bands, transcendentalist lyrics, all kinds of rhythmic and harmonic surprises, and a filter that made John Lennon sound like God singing through a foghorn".