At least it wasn’t Shaw who wrote “Exit in case of Brahms.”
That was Philip Hale of the Boston Globe.
Brahms, about whom I wrote a dissertation, was music’s great historian among composers.
Like Mozart, whose style was enhanced after his study of Bach, Brahms’ stlyle was deeply informed by his contact with the Baroque master.
My thesis was that Brahms music, at its core, was more neo-Baroque than neo-Classical.
In his early twenties he actually took several years off from composition to explore music from previous centuries, including, among others, the
compositions of Heinrich Schultz. He emerged from his hiatus with a style enriched with contrapuntal sophistication.
While he examined music from the Renaissance and early and late Baroque, his greatest love was Bach. He would sit for hours and improvise on the piano and organ in the style of Bach.
Of course, Beethoven was his spiritual mentor as well. But in no other major Romantic composer (Reger excepted, if you consider him major) will you find the essence of Baroque style intrinsically infused in his writing. Aside from the Requiem, the four concertos find obvious references to Baroque contrapuntal and concertato style. We can hear conspicuous differences, for example from the early piano sonatas to the later piano concertos. Whereas Mendelssohn and Schumann, to name two, referenced the Baroque symbolically, Brahms actually got into the nuts and bolts of its construction.
Ironically, even though he was the leader of the opposite camp, Wagner also demonstrates a strong affinity to the Baroque. He just didn’t write symphonies, concertos, sonatas, string quartets etc. But one can find copious evidence of Baroque awareness in his operas.