Morris Kline classifies the four elements of the quadrivium as pure (arithmetic), stationary (geometry), moving (astronomy) and applied (music) number.
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At many medieval universities, this would have been the course leading to the degree of Master of Arts (after the BA).
One of his works is Quadrivium for four percussionists and four orchestral groups (played for the first time at the Royan Festival in 1969).