Should they ever do so, and tune the instrument to the modern pitch, the consternation of the singers would be great; for the music is all written for the existing organ, and could not be performed two notes higher, not to mention the confusion that would arise where all the music is sung at sight by singers accustomed to an unusual pitch. This is a fact not generally known, but worthy of notice. The music sung in Saint Peter's, and, indeed, in most Roman churches, is never rehearsed nor practised. The music itself is entirely in manuscript, and is the property of the choir master, or, as is the case in Saint Peter's, of the Chapter, and there is no copyright in it beyond this fact of actual possession, protected by the simple plan of never allowing any musician to have his part in his hands except while he is actually performing it. In the course of a year the same piece may be sung several times, and the old choristers may become acquainted with a good deal of music in this way, but never otherwise. Mozart is reported to have learned Allegri's Miserere by ear, and to have written it down from memory. The other famous Misereres, which are now published, were pirated in a similar way. The choir master of that day was very unpopular. Some of the leading singers who had sung the Misereres during many years in succession, and had thus learned their several parts, met and put together what they knew into a whole, which was at once published, to the no small annoyance and discomfiture of their enemy. But much good music is quite beyond the reach of the public--Palestrina's best motetts, airs by Alessandro Stradella, the famous hymn of Raimondi, in short a great musical library, an 'archivio' as the Romans call such a collection, all of which is practically lost to the world. It is wonderful that under such circumstances the choir of Saint Peter's should obtain even such creditable results. At a moment's notice an organist and about a hundred singers are called upon to execute a florid piece of music which many have never seen nor heard; the accompaniment is played at sight from a mere figured bass, on a tumble-down instrument two hundred years old, and the singers, both the soloists and the chorus, sing from thumbed bits of manuscript parts written in old-fashioned characters on paper often green with age. No one has ever denied the extraordinary musical facility of Italians, but if the outside world knew how Italian church music is performed it would be very much astonished.