Unquestionably the earliest vein of Palestrina's composition was influenced by his Flemish training, and he returned to this florid and ingenious style in later time when he set the old melody of "_L'Homme Armé_" as a Mass. This was a very natural proceeding. We have alluded above to the custom of setting masses around a secular core, using some popular melody as _cantus firmus_, as practised by the Netherlanders. When Palestrina chose the above-named melody, he entered deliberately into the lists with them; so many of his predecessors had used the self-same _cantus_ that "_L'Homme Armé_" became in some degree a challenge and a specimen of competitive composition; skill and complexity were to rule in such a mass, and it is sufficient to say that Palestrina overtopped his competitors in these, and therefore the object of this work was attained. It may stand as the best example of the first school. The _Improperia_ are a series of antiphons and responses which, on the morning of Good Friday, take the place of the daily Mass of the Catholic church. They represent the remonstrances of the suffering Savior with the people for their ingratitude for his benefits, whence the title "_Improperia_," i. e. "the Reproaches." We have stated that the old pure school did not portray emotion in the modern style; one may not find in these "Reproaches" of Palestrina the entirely human style of a Luzzi's "Ave Maria" or the operatic manner of a Rossini's "Stabat Mater," but the simple combination of dignity with sorrow is nevertheless far more effective and suitable to the religious service; it is therefore not surprising to find these _Improperia_ (the first revelation of the genius of Palestrina) still retained in annual use in the Papal Chapel, and we may class them as Hauptmann did, as the best example of Palestrina's second manner. Mendelssohn held them to be Palestrina's most beautiful work, and the poet Goethe was also greatly moved by them. The Mass of Pope Marcellus has been cited as the best example of the master's third style, and at the same time the culmination of his powers. This Mass is in the so-called Hypo-Ionian mode (although the "Crucifixus" and "Benedictus" are Mixo-Lydian), and is probably the noblest example of the employment of the church modes in the pure style. Although the work is most intricate, Palestrina has here achieved that most difficult feat, the art of concealing art. It presents all the old fugal artifices, and the "Agnus Dei" is a close and ingenious canon. It is written for six voices, soprano, alto, two tenors, and two basses. This in itself was an unusual combination of voices and gave opportunities for great antiphonal effect, between the lower voices, and these opportunities are so well used that the effect of a double choir is frequently attained.