Related Clues:

• In __ (harmonized)
• Tandem
• Coordinate, digitally
• Pop music's 'N __
• Cause to coincide
• Concert
• Film dubber's concern
• Out of ___ (not harmonizing)
• Together (with ''in'')
• Set to the same time
• Match audio and video
• In __ (together)
• Type of singing
• Cause to coincide (Abbr.)
• Perfect rapport