In ancient practice, Practica denoted musical matters such as
teaching, performance, composition, hearing,
and perhaps even musica speculativa


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“The power that the theorist has to have to fortify an untenable position comes from his alliance with aesthetics.  Now aesthetics only deals with the eternal things, thus comes too late in life.  People call that ‘conservative’.  But this is just as absurd as a conservative express train.  The advantages that aesthetics assures the theorist are too great, however, for him to worry about this absurdity.”
A. Schoenberg Theory of Harmony