“Allegri's famous "Miserere", a 17th-century sacred work, was kept secret by the Vatican. No one was allowed to transcribe or perform it outside the Sistine Chapel, on pain of excommunication.

But during Holy Week in Rome in 1770, Mozart attended services(…)”

“Flemish composer Johannes Ockeghem (1410-1497) was a master of technical challenges and musical games ! In his "Missa cujusvis toni", he conceived a single score that could be sung in 4 different keys. Instead of keys, a simple "?" guided the singers(…)”