Picture a shaded square in Toulouse, lunch plates still warm, when a brass band crashes in — drums clattering, trumpets blaring — and half the restaurant starts singing. That's the grip of "Dans les yeux d'Émilie," the tune that has quietly become the anthem of French village parties, rugby crowds and municipal celebrations from the Landes to Dunkerque.

The story starts in 1977, when Joe Dassin — the US-born singer, son of Rififi director Jules Dassin — released it as a tender, wistful love song. It might have stayed that way, were it not for l'Harmonie de Pomarez, a banda from the Landes region of southwestern France. Somewhere in the 2010s, the group reworked the track into a party weapon: they took one verse, layered in chanted "oh, oh, ooooh" refrains, and built towards a chorus that reliably sends festival crowds over the edge.

Bandas themselves are the backbone of the scene — fanfare groups with Mexican roots, all brass and percussion, that roam fêtes playing with more enthusiasm than polish. The song spread through the grandes fêtes of the southwest, notably Dax, Bayonne and Condom, then north to the massive carnival at Dunkerque. Its national breakthrough came in 2023, when bands played it at Rugby World Cup matches across France. By that point l'Harmonie de Pomarez's version had already collected 6 million Spotify streams and 7.1 million YouTube views.

The writer behind the piece describes hearing it three times in a single summer — in Toulouse's place Saint-Georges, at a strawberry fair, even at a vintage fire engine display — where a firefighter at the beer stand was genuinely astonished anyone might not know it. That's how deep it runs. And yes, there's an honest caveat: the mass singalong usually peaks once the local wine has done its work. The disinhibition is part of the arrangement.

For travellers, this is more than music trivia. Time a trip to southwest France between May and September and you'll find yourself inside the tradition: Dax's five-day fête with its bull runs, Bayonne's half-million-strong July street festival, or Condom's Festival Européen de Bandas y Peñas, which gathers dozens of these fanfares in one Gascon town. You don't need tickets or French — you need to be in a square when the horns strike up. One chorus and you'll know the words. Whether you go for the rugby, the strawberries or the armagnac, the song is the thread that stitches it all together.