In the middle ages, as in antiquity, the laws of harmony were unknown; when it was desired to sing in two parts, they sang at first in intervals of fifths and fourths, where it would have seemed much more natural to sing in thirds and sixths. Such first attempts at music in several parts were made in the thirteenth, fourteenth and fifteenth centuries, when they were hunting for laws, and such music was discordant. It bore the name of Diaphony. The real Polyphony came in the sixteenth century with the school of Palestrina. Later on, little by little, laws were established, not arbitrarily, but laws resulting from a long experience, and during all the sixteenth century admirable music was written, though deprived of melody, properly speaking. Melody was reserved for dance music which, in fact, was perfectly written in four and even in five part scores, as I have been able to convince myself in hunting for dance music of the sixteenth century for my opera "Ascanio." But no indication of movement, nuances or shading, enlightens us as to the manner in which this music should be interpreted. At Paris the first attempts to execute the music of Palestrina were made in the time of Louis Philippe, by the Prince of Moscow. He had founded a choral society of amateurs, all titled, but gifted with good voices and a certain musical talent. This society executed many of the works of Palestrina and particularly the famous "Mass of Pope Marcellus." They adopted at that time the method of singing most of these pieces very softly and with an extreme slowness so that in the long-sustained notes the singers were forced to divide their task by some taking up the sound when the others were out of breath. Consonant chords thus presented evidently produced music which was very agreeable to the ear, but unquestionably the author could not recognize his work in such rendering. Quite different was the method of the singers in the Sistine Chapel when I heard them for the first time in Rome in 1855 when they sung the "Sicut Cervus" of Palestrina. They roared in a head-splitting way without the least regard for the pleasure of the listener, or for the meaning of the words they sang. It is difficult to believe that this music was ever composed to be executed in such a barbarous manner, which, it seems to me, differs completely from our musical conceptions; and it is a great mistake also in modern editions of such music to introduce delicate shadings or nuances and even employ the words "very expressive." Palestrina has had his admirers among French literary writers. We recall the scene created by Octave Feuillet in "M. de Camors." M. de Camors is at his window; a lady is at the piano; a gentleman at the cello, and another lady sings the Mass of Palestrina which I have referred to above. Such a way of playing this music is simply out of the question. Feuillet had obtained his inspiration for this from a fanciful painting which he had seen somewhere.