In the evening his holyness returned into the chapel of SIXTUS, where the Miserere (LI Psalm) was sung by voices, without any instruments accompanying them; which is accounted one of the finest pieces of music that ever was composed. And really, there is something so solemn, and so affecting in it, that it is beyond expression: and it is so highly esteemed, that the master of the chapel is forbidden, under pain of excommunication, to give a copy of it himself, or to suffer any one to transcribe it.