異口同聲 with one voice

異 (different) 口 (mouth)
同 (same) 聲(sound)

Alternate version: 異口同音

Would it be uncontested unanimity?
Complete solidarity?
Forced consensus?
Mindless parroting?
Mocking parody?
Reluctant repetition?
Apathetic agreement?
Harmonious chorus?
Resonant echo?
Tautological iteration?
Collective wisdom?

Whatever it is, you are in concert.
Play me a true tune.