The Beatles in mono: This is how most listeners first heard the group in the 1960s, when mono was the predominant audio format. Up until 1968, each Beatles album was given a unique mono and stereo mix, but the group always regarded the mono as primary. SGT. PEPPER'S LONELY HEARTS CLUB BAND is released in mono on 180-gram vinyl with faithfully replicated artwork, newly mastered from the analogue master tapes.