Related Clues:

• Clash
• Harmony, briefly
• In ___ (coordinated)
• Crash
• Match up
• Lip-___ (not really sing)
• Put in harmony
• Harmonization, for short
• Simultaneity
• Match, informally
• Good thing to be in
• Lip-__
• Fit the sound to the action, e.g.
• Fit sound to action, e.g.
• Lip ---