Possible Clues:

• Title girl in a 1965 #1 hit
• 'Hang On ___' (official rock song of Ohio)
• 'Hang on __': 1965 #1 hit
• "Hang on __": 1965 #1 hit
• 'Hang On ___' (1965 #1 hit)
• "Hang On ___"
• One told to hang on, in song