According to the Internet source given below, Francesco Cavalli was an Italian organist and composer. He was associated with St Mark's all his life. Just as Claudio Monteverdi, his teacher, he applied his genius to vocal music, writing dozens of operas for the public theatres of Venice, Naples, and Milan. The extreme range of the emotions that he expressed musically, from the most poignant lament to the broadest joke, is still remarkable; the beauty of his lyricism is well preserved when certain of his lovely airs, written for voice, are set for instruments.