The music contrasts replicant with human voices. In one song, a female replicant sings a blues lament accompanied by prepared piano. In another, a replicant chorus chants machine songs against a backdrop of rhythmical synthesiser sounds. By contrast, two extended arias are sung by a soprano and a tenor: a fervent prayer that layers up pianos and glass harmonica, and a lyrical love song with tuned percussion, strings and solo cello.