Composer as philosopher?

If we agree that Marx retooled Hegel's Dialectic and transformed it into his own version of Dialectical Materialism then I would have to say that in some ways... 'the drivers of the tanks as they rolled into Budapest in 1956 were motivated by Hegel´s dialectic,' is a true statement. Of course, by that time, Marx's theories had been hardened into incontrovertible truths, i.e., ideology. Just one of many cast in iron ideologies that continue to plague us early into the 21st Century.

A year or two before the tanks rolled into Budapest, I recall listening to a lecture by Isaiah Berlin,  from which one mention of music has always stuck.   To Hegel, he said, the way thought worked was "like a symphony".    I think what he meant was that Hegel's dialectic worked along the same lines as sonata form  - Thesis/first subject: antithesis/second subject: synthesis/ the whole movement achieved through the conflict of the development.  Curiously, sonata form doesn't seem to have been defined until the mid 1820s, well after Hegel had established himself, so it might be that the musical theorists who got there were influenced, more than they thought, by Hegel's ideas.   But equally, if a symphonist can evolve, for his own purposes, what can be adapted as a model for a certain vision of logic, it may not be  so very far-fetched to consider Mozart as, at least, an exponent of certain aspects of eighteenth century ideas about morals.  The Enlightenment didn't much go in for restrictive practices in ideas.  Anyone could join in.