Allegri, Gregorio (b Rome, 1582 - d Rome, 7 February, 1652)
Allegri was a singer and composer at the cathedrals of Fermo and Tivoli, and later maestro di cappella of Spirito in Sassia, Rome, and a singer in the papal choir. He composed many of his works for the papal choir, and that of Santa Maria in Vallicella. Today, his reputation rests of his Miserere a setting of psalm 51 traditionally sung every Holy Week by the papal choir. Allegri was best writing for choir alone, and he wrote five a cappella masses, and he published three books of small scale concertato church music.