 In addition to citing it as the precedent for early experimental works by bands including Love and Jefferson Airplane, Decker writes that "Rubber Soul" presented "a variety of techniques hitherto unexplored in popular music" while encouraging listeners "to be cognizant of more flexible dimensions of pop music and to "desire" and "expect" them as well".Music historian Simon Philo also sees it as heralding the experimentation that characterised late-1960s rock.He describes it as an album-length confirmation of the "transformation of pop's range and reach" that the Beatles had first achieved when "Yesterday", McCartney's introspective and classically orchestrated ballad, topped US singles charts in late 1965.