Monteverdi employs specific musical devices to signify moods and situations. For example, triple metre signifies the language of love for Nerone and Ottone (unfulfilled in the latter case); forceful arpeggios are used to represent conflict; and the interlacing of texts, written as separate verses by Busenello, indicates sexual tension in the scenes with Nerone and Poppea, and escalates the discord between Nerone and Seneca. The technique of "concitato genere"—rapid semiquavers sung on one note—is used to represent rage. Secret truths may be hinted at as, for example, when Seneca's friends plead with him to reconsider his suicide in a chromatic madrigal chorus which Monteverdi scholar Denis Arnold finds reminiscent of Monteverdi's Mantuan days, carrying a tragic power rarely seen in 17th century opera. This is followed, however, by a cheerful diatonic section by the same singers which, says Rosand, suggests a lack of real sympathy with Seneca's predicament. The descending tetrachord ostinato on which the final duet of the opera is built has been anticipated in the scene in which Nerone and Lucano celebrate Seneca's death, hinting at an ambivalence in the relationship between emperor and poet. According to Rosand: "in both cases it is surely the traditional association of that pattern with sexual love that is being evoked."