Emilio de' Cavalieri, Italian organist and composer (born 1550)

Emilio de' Cavalieri, or Emilio dei Cavalieri, was an Italian composer, producer, organist, diplomat, choreographer and dancer at the end of the Renaissance era. His work, along with that of other composers active in Rome, Florence and Venice, was critical in defining the beginning of the musical Baroque era. A member of the Roman School of composers, he was an influential early composer of monody, and wrote what is usually considered to be the first oratorio.

March 11 is the 70th day of the year in the Gregorian calendar; 295 days remain until the end of the year.