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Here are six lectures Leonard Berstein gave at Harvard University in 1973. They are YouTube videos.. Quality is very good.
They are long, but there is a wealth of information, drawing on many aspects of music, outside of the normal 'notes vs rhythm' In the first lecture, he postulates that there is a human 'internal language' that all humans have.. Because of our physical build (lungs, vocal chords, mouthy cavity, nose resonantence etc). Music (human vocalization of sound) was the first language.
Leonard Bernstein’s Masterful Lectures on Music (11+ Hours of Video Recorded at Harvard in 1973)
