Possible Clues:

• "Let — already!"
• Bo Diddley "Don't Let ___"
• 'Let ___' ('Quit worrying')
• ''Let ___!'' (advice to the obsessed)
• "Let ___!" (advice to the obsessed)
• 'Let ___'
• 'Let ___!' (advice to the obsessed)
• Tom Petty "You say I should let ___"
• "Let ---!"
• ''Let ---!'' (advice to the obsessed)