Related Clues:

• Musical start, for short
• Speaker's lead-in
• It mentions the words "more perfect"
• Many a freshman course
• Words about a speaker, briefly
• First lines
• First song on an album, perhaps
• "We the people" source
• Preambles, briefly
• Emcees' duties
• Emcees' openers
• Host's responsibility
• Low-level course
• 101 course, generally
• 'Ladies and gentlemen ...,' e.g.