Fifty years ago, the Beatles walked across a street in London for a photo shoot that would become the cover of their next album, Abbey Road — an anniversary that was commemorated on Thursday with crowds and news crews. But for John Kosh, the Apple Records art director who had to turn those shots into an album cover, that was only step one in creating one of rock’s most recognizable covers. In 1969, Kosh was what he calls the “creative art ...