👉 A tetradesmus is a type of musical notation used in the ancient Greek and Roman cultures. It was developed by the musician Aeschylus, who is known for his plays such as "The Trojan Women" and "The Eumenides." Tetradesmus is characterized by its use of twelve lines (tetrads) per measure, which allows for a more complex musical structure and division into sections or themes. It was often used in the form of a sheet music notation system