Sistine Chapel ceiling of the Sistine Chapel. At the outset, the plaster, "intonaco", began to grow mold because it was too wet. Michelangelo had to remove it and start again. He then tried a new formula created by one of his assistants, Jacopo l'Indaco, which resisted mold and entered the Italian building tradition. Because he was painting "fresco", the plaster was laid in a new section every day, called a "giornata". At the beginning of each session, the edges would be scraped away and a new area laid down. The edges between "giornate" remain slightly visible; thus, they give a good idea of
Sistine Chapel Choir Michael's Cathedral Basilica. Sistine Chapel Choir The Sistine Chapel Choir, as it is generally called in English, or properly the "Coro della Cappella Musicale Pontificia" in Italian, is one of the oldest choirs in the world, having been formally active since 1471. Based in Vatican City, it normally comprises twenty men (tenors and basses) and thirty boys (sopranos and altos), the latter receiving free tuition. As early as in the pontificate of Sylvester I (314–35), a regularly constituted company of singers, under the name of "schola cantorum", lived together in a building devoted to their exclusive use. The word ""schola""