In the dedicatory epistle to the duke of Tuscany, prefixed to the score, Gluck defines his intentions. He says: "I seek to put music to its true purpose; that is, to support the poem, and thus to strengthen the expression of the feelings and the interest of the situation, without interrupting the action. I have therefore refrained from interrupting the actor in the fervor of his dialogue by introducing the accustomed tedious _ritournelle_; nor have I broken his phrase at an opportune vowel that the flexibility of his voice might be exhibited in a lengthy flourish; nor have I written phrases for the orchestra to afford the singer opportunity to take a long breath preparatory to the accepted flourish; nor have I dared to hurry over the second part of an aria, when such contained the passion and the most important matter, to find myself in accord with the conventional repeat of the same phrase four times. As little have I permitted myself to close an aria where the sense was incomplete, solely to afford the singer an opportunity of introducing a cadenza. In short, I have striven to abolish all these bad habits, against which sound reasoning and true taste have been struggling now for so long in vain." There were several numbers in "_Alceste_" which exercised an influence upon subsequent composers, among the more notable being the speech of the oracle, which Mozart must have had in mind in writing the commandatore's reply to Don Giovanni; and the sacrificial march, which probably influenced the priests' march in the "Magic Flute." Gluck was forty-eight when he wrote "Orpheus," and fifty-three when "_Alceste_" appeared.