Possible Clues:

• Group didn't flog as much with one single out
• The __: John, Paul, George and Ringo
• Rock band that memorably played Carnegie Hall on 2/12/1964, with 'the'
• Band whose song 'Revolution 9,' when played backward, supposedly contained the message spelled out by the first letters of this puzzle's songs
• Band that released 'Come Together' in 1969 and broke up in 1970
• Fabulous quartet without rhythm? Not entirely
• 'Help' band, with 'the'
• John and Paul, once
• Best ale for the Liverpudlian group
• Classic band, with "The"