Possible Clues:

• Song sung under a window
• Song composed to win lady's heart
• Noted performance of plucky chap, perhaps, looking up to girl?
• See a nerd performing romantic song
• Piece of music composed around this era
• Love song composed about Bill
• Song composed about a delta
• Sing (to a lover?)
• Bill joins in peaceful song
• Ears need to be adjusted for love song