I Cantori Gregoriani are a male voice group which exclusively dedicates itself to the study and the spread of Gregorian chant. Consisting entirely of specialists, the ensemble bases its own performances on the research of semiology, that is the study of antique manuscripts dating from the Xth –X1th centuries. The performances of the group are aimed at transmitting, through the actual instruments of the semiology, the expressive force of Gregorian chant, i.