什么是 concert?Music A performance given by one or more singers or instrumentalists or both.Agreement in purpose, feeling, or action.Unity achieved by mutual communication of views, ideas, and opinions: acted in concert on the issue. Concerted action: "One feels between them an accumulation of gentleness and strength, a concert of energies” ( Vanity Fair). To plan or arrange by mutual agreement.To adjust; settle.To act together in harmony.