Revolver (Beatles album) as the Beatles'. While also highlighting the importance of the production, David Howard writes that "Revolver" was a "genre-transforming album", on which Martin and the Beatles had "obliterated recording studio conventions". Combined with the similarly "visionary" work of American producer Phil Spector, Howard continues, through "Revolver", the recording studio had become "its own instrument; record production had been elevated into art." Whereas "Sgt. Pepper" had long been identified as the Beatles' greatest album, since the 2000s "Revolver" has often surpassed it in lists of the group's best work. Sheffield cites the album's 1987 CD release, with the full complement of
A Collection of Beatles Oldies of the Beatles' achievement just before the plunge into 'Strawberry Fields' and "Sgt. Pepper"".<ref name="Ginell/AM"></ref> According to a December 1971 report in "Billboard" on the preference for UK-pressed LPs among Los Angeles record-buyers, "A Collection of Beatles Oldies" was one of the most popular imported titles, and recognised as good value for its generous number of songs relative to the US industry standard. For many years after its release, the 1966 compilation remained the only British album to contain the Beatles' version of "Bad Boy". Although briefly available on the Music for Pleasure budget label, it was superseded by subsequent