Related Clues:

• In __ (harmonious)
• In ___ with
• In ___ (matching, as audio and video)
• 'N -- (pop boy band)
• Short agreement?
• Lip-___ (mime to a recorded song)
• Same-note singing
• Lip ___ contest
• In ___ (harmonized)
• Musical agreement
• Harmony or agreement
• Voices in complete agreement
• Sameness in pitch
• In agreement or concord
• Concord, sounding or singing together