Scenes are elaborate and are changed frequently throughout the play. Cai luong is similar to the Western operettas and more easily depicts the inner feelings of the characters. Songs of the Cai luong are based on variations of a limited number, perhaps 20, of tunes with different tempos for particular emotions - this convention permits a composer to choose among 20 variations to express anger, and as many to portray joy.
The principal supporting songs in Cai Luong is the Vong Co (literally, nostalgia for the past). Cai luong owes much of its success to the sweet voices of the cast, much appreciated by the audience. Upon hearing the first bars of the well-loved Vong Co, the audience reacts with gasps of recognition and applause.