More than three decades after his tragically early death, Glenn Gould’s performances are still the standard by which every new recording of Bach’s keyboard works is judged. A new 4-CD Masters box gathers two classic Gould recordings from the 1970s: the French Suites, considered “one of the landmarks in the discography” (MusicWeb International), along with his “powerful and masterly” (BBC Music Magazine) interpretations of the English Suites.