On the Execution of Music, and Principally of Ancient Music

This lecture opens with a vivid portrait of how early music was written in almost indecipherable scripts, only to be reshaped by the emergence of plainchant and its square‑note notation. Saint‑Saëns walks listeners through the medieval struggle to give voice to sacred melodies, exploring the shift from heavy, low tones to the lighter, clearer registers once recommended by St. Isidore. He highlights the challenges early reformers faced when trying to recover the original purity of these long, meditative chants.

The discussion then moves to the Renaissance, where the Palestrina school introduced disciplined triads and the first true polyphony, yet often at the expense of expressive melody. Saint‑Saëns compares contrasting performance practices—from the delicate, breath‑shared singing of a Parisian amateur chorus to the overpowering, breathless delivery he encountered in the Sistine Chapel—illustrating how interpretation can alter the very soul of ancient music. Listeners gain insight into the evolving laws of harmony and the enduring quest to honor the intentions of the original composers.