Historical clue formulations

• It's not required — 2012-09-19
• Music Appreciation 101, perhaps — 2010-03-21
• Certain course — 1999-11-26
• Enrichment course — 1999-10-15
• Public Speaking 101, e.g. — 1999-07-10
• You don't have to take it — 1999-01-29