Symphony No. 40 in G Minor, K. 550

In the summer of 1788, Mozart was broke, ignored by the Viennese public, borrowing money from Michael Puchberg with letters so abject they make you want to reach through time and hand him a check. His infant daughter Theresia had just died. His wife Constanze was ill. His subscription concerts had dried up. And in approximately six weeks, between June and August, he composed three symphonies — the 39th, 40th, and 41st — that represent the summit of Classical-era orchestral writing. There is no evidence he was ever paid for any of them.

The 40th is the dark one. It's one of only two Mozart symphonies in a minor key — the other being the 25th, written when he was seventeen — and it has a restlessness, an anxiety, that his major-key works rarely show. The famous opening theme isn't grand or heroic. It's nervous. The repeated-note figure in the violins has the quality of a heartbeat that's running too fast, and the melody that rises above it keeps reaching for resolution and being pulled back into uncertainty.

There is no slow introduction. The symphony starts immediately, in medias res, as if you've walked into a conversation that was already happening without you. This was unusual for the era and wouldn't become standard practice until Beethoven made it mandatory. Mozart was, as usual, ahead of the schedule that history would later construct.

The finale is one of the most relentless movements in the Classical repertoire — a moto perpetuo that drives forward without rest, building tension that the final bars release not with triumph but with a kind of exhausted resignation. It is not a happy ending. Mozart, who understood happiness as well as anyone who ever lived, also understood that sometimes the truest thing a piece of music can do is refuse to fake it. The 40th Symphony doesn't fake it. It is the sound of genius under financial, emotional, and physical pressure, and it is magnificent precisely because of what it cost.

Recording: Wikimedia Commons recording “Mozart - Symphony No. 40 in G minor, K550 - II. Andante (Musopen Symphony)”. Public domain. Source: https://commons.wikimedia.org/wiki/File%3AMozart_-_Symphony_No._40_in_G_minor%2C_K550_-_II._Andante_%28Musopen_Symphony%29.flac