Possible Clues:

• Slangy assents
• "She loves you" followers, in song
• A lot of the Beatles' 'She Loves You'
• Informal assents
• 'She Loves You' shouts
• Some of a Beatles refrain
• Much of the Beatles' 'She Loves You'
• A lot of Britney Spears's 'Oops … I Did It Again'
• Informal affirmatives
• Common lyrical throw-ins