In previous generations, some artists made very successful careers of presenting revivals or reworkings of once-popular tunes, even out of doing contemporary cover versions of current hits.[1] Since the 1950s, musicians now play what they call "cover versions" (the reworking, updating, or interpretation) of songs as a tribute to the original performer or group.[1] Using familiar material (such as evergreen hits, standard tunes or classic recordings) is an important method of learning music styles. Until the mid-1960s most albums, or long playing records, contained a large number of evergreens or standards to present a fuller range of the artist's abilities and style. (See, for example, Please Please Me.) Artists might also perform interpretations ("covers") of a favorite artist's hit tunes[4] for the simple pleasure of playing a familiar song or collection of tunes.[5]