Related Clues:

• Tri- less two
• Precursor to 41-Across
• Prefix with brow
• Form intro
• Lateral or cycle lead-in
• Stereo divided by 2
• Like early Beatles recordings
• Single starter
• Single-track
• The kissing disease, for short
• One, for openers
• Lateral beginning
• Like 45s
• Verse opening
• "Mono" cousin