The second half is Brahms's Fourth, his last symphony and arguably his most unflinching: a passacaglia finale built on a baroque ground bass, emotional weight without sentimentality.

For a conductor, it's one of the most demanding pieces in the repertoire, and not just technically. The first movement alone is a masterclass in long-form tension: those two blunt opening chords are deceptively simple, and everything that follows is a slow, relentless buildup of harmonic and rhythmic pressure. Getting an orchestra to breathe through that movement — to hold the architecture together over nearly 20 minutes — requires extraordinary pacing instincts.

The second movement, the famous Marcia funebre, is where conductors often reveal their interpretive philosophy most clearly. Too slow and it collapses under its own weight; too brisk and the grief feels perfunctory. The fugal development section in the middle demands clarity without losing the emotional thread.

Then there's the scherzo — a sudden burst of wit and energy that conductors must resist the urge to over-clarify, letting its off-beat surprises land with spontaneity.

What makes the Eroica endlessly fascinating is that Beethoven wrote a work about struggle and transformation that itself requires struggle and transformation from every ensemble that takes it on. No two performances feel quite the same — and that's exactly the point.