Related Clues:

• 'He-e-ere's Johnny!,' e.g.
• First paragraph
• It may begin "And now ..."
• Emcee's lines
• Conclusion's opposite, briefly
• "SNL" host's monologue, e.g.
• Starter
• DJ's concern
• First few bars
• Foreword, briefly
• Small loudspeaker
• 101 class, briefly
• Musical start, for short
• Speaker's lead-in
• Many a freshman course