Possible Clues:

• A-list choir medley from a former era
• Concerning past events
• Relating to a past era
• Dealing with past riots badly disrupting American states
• After reorganisation, I lost chair of Ancient Studies
• Documented
• Like Sabatini's Nights
• Based on records, offering this car oil-change
• Authentic playing - is it choral?
• It's well-documented - old subject cut ponytail in the middle of radicalism