Originally published in Motettorum liber secundus, 5, 6, 8vv (Venice, 1572). Facsimile of 2nd edition (1577) is available on IMSLP: [click here to go to score](http://imslp.org/wiki/Motettorum_-_Liber_Secundus_(Palestrina,_Giovanni_Pierluigi_da)). Files are taken from Choral Wiki: [click here to go to score](http://www3.cpdl.org/wiki/index.php/Tu_es_Petrus_a_6_(Giovanni_Pierluigi_da_Palestrina)). Edited by Gerd Eichler, with original note values and pitches. Ficta added by the editor (as accidentals into the score itself, not above the staff as suggestions). Transcribed from Corollarium Cantionum Sacrarum, Nuremberg, 1596. Text is Matthew 16:18–19. Musical form is aB | cB (B = repetition of same text and music ["et tibi dabo claves regni caelorum," start of Matthew 16:19], | = division between the prima and secunda partes)