Historical clue formulations

• Harmonic R&B subgenre — 2025-02-09
• The Four Knights' genre — 2024-08-18
• Singing style with African-American roots — 2021-01-30
• Harmonic singing style — 2010-10-07
• It was sung in Rocky Balboa's neighborhood — 2010-07-31
• It used to be sung on street corners — 2003-12-04
• 1950's music style — 2003-05-19
• Pop music style — 1995-12-20