Marbrianus de Orto
...that Marbrianus de Orto was one of the first composers to write a completely canonic setting of the Ordinary of the Mass?
...that <b id="mwAoU"><a href="./Marbrianus_de_Orto" id="mwAoY" rel="mw:WikiLink" title="Marbrianus de Orto">Marbrianus de Orto</a></b> was one of the first <a href="./Composer" id="mwAoc" rel="mw:WikiLink" title="Composer">composers</a> to write a completely <a href="./Canon_(music)" id="mwAog" rel="mw:WikiLink" title="Canon (music)">canonic</a> setting of the <a class="mw-redirect" href="./Ordinary_of_the_Mass" id="mwAok" rel="mw:WikiLink" title="Ordinary of the Mass">Ordinary of the Mass</a>?