Related Clues:

• Match, informally
• Matched, after 'in'
• What some singers sing in
• Good thing to be in
• People often sing in it
• A choir may sing in it
• Coincidence in pitch
• Lip-__
• Sound/picture agreement
• Fit the sound to the action, e.g.
• Fit sound to action, e.g.
• Lip ---
• Lip- --
• Homophony
• Harmonization