Keywords: Tu es Petrus.png de Antiphon Tu es Petrus http //gregobase selapa net/chant php id 1950 author medieval All chant transcriptions are released under CC0 a k a Public Domain license http //gregobase selapa net/ page_id 2 Tu es Petrus et super hanc petram aedificabo Ecclesiam meam Antiphon PD-old |