Gregorio Allegri (1582 — 17 February 1652) was an Italian composer of the Roman School and brother of Domenico Allegri; he was also a priest and a singer. He lived mainly in Rome, where he would later die.
He studied music as a puer (boy chorister) at San Luigi dei Francesi, under the maestro di capella Giovanni Bernardino Nanino, brother of Giovanni Maria Nanino. Being intended for the Church, he obtained a benefice in the cathedral of Fermo. Here he composed a large number of motets and other sacred music, which, being brought to the notice of Pope Urban VIII, obtained for him an appointment in the choir of the Sistine Chapel at Rome with the contralto role. He held this from 6 December 1629 until his death. As Andrea Adami wrote, in character, Allegri was regarded as singularly pure and benevolent.
Among the musical compositions of Allegri were two volumes of concerti for five voices, published in 1618 and 1619; two volumes of motets for six voices, published in 1621; an edition of four-part sinfonia; five masses, two settings of the Lamentations of Jeremiah, as well as numerous motets which were not published in his lifetime. He was one of the earliest composers for stringed instruments, and Athanasius Kircher has given one specimen of this class of his works in his Musurgia. Most of Allegri’s published music is in the more progressive early Baroque concertato style, especially the instrumental music. However, his work for the Sistine Chapel is descended from the Palestrina style, and in some cases strips even this refined, simple style of all ornament. He is credited with the earliest string quartet.
By far the most well known and regarded piece of music composed by Allegri is the Miserere mei, Deus, a setting of Vulgate Psalm 50 (also numbered as Psalm 51). It is written for two choirs, the one of five and the other of four voices, and has obtained considerable celebrity. One of the choirs sings a simple fauxbordon based on the original plainsong chant for the Tonus peregrinus; the other choir sings a similar fauxbordon with pre-existing elaborations and the use of cadenzas. The Miserere has for many years been sung annually during Holy Week in the Sistine Chapel. Many have cited this work as an example of the stile antico (old style) or prima pratica (first practice). However, its constant use of the dominant seventh chord and its emphasis on polychoral techniques certainly put it out of the range of prima pratica. A more accurate comparison would be to the works of Giovanni Gabrieli.
The Miserere is one of the most often-recorded examples of late Renaissance music, although it was actually written during the chronological confines of the Baroque era; in this regard it is representative of the music of the Roman School of composers, who were stylistically conservative. The work acquired a considerable reputation for mystery and inaccessibility between the time of its composition and the era of modern recording; the Vatican, wanting to preserve its aura of mystery, forbade copies, threatening any publication or attempted copy with excommunication. They were not prepared, however, for a special visit in 1770 from a 14-year-old named Wolfgang Amadeus Mozart, who, on a trip to Rome with his father, heard it but twice and transcribed it faithfully from memory, thus creating the first known unauthorised copy.
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Heavenly and Holiest music pleading Our Lord God to have Mercy on us-Psalm 51 ,Wonderful and ethereal !!