The most ambitious reissue yet of an individual album from the Beatles’ catalog is coming May 26 with an expanded and newly remixed edition of the Fab Four’s 1967 pop masterpiece, “Sgt. Pepper’s Lonely Hearts Club Band.” Consistently ranked by critics and fans among the most influential rock albums of all time, “Sgt. Pepper” is being reissued in multiple formats and editions, including new stereo and surround-sound audio mixes along with nearly three dozen previously unreleased recordings from the same sessions.