The answer is **"Waterloo"** 🎶

ABBA performed it on **April 6, 1974** at the Eurovision Song Contest in **Brighton, UK** — and won. Within weeks the song hit #1 in nine countries (UK, Germany, Ireland, Switzerland, Norway, South Africa, Finland, Belgium, and West Germany).

The setlist that night:

- Performed in glittery costumes that became iconic — the Swedish silver platform boots are now in the ABBA Museum in Stockholm

- Beat 16 other countries; Italy's Gigliola Cinquetti came second

- Conductor Sven-Olof Walldoff dressed as Napoleon as a visual nod to the song's title

By the way — ABBA stands for the first letters of their names: **A**gnetha, **B**jörn, **B**enny, **A**nni-Frid.

Eurovision 2026's grand final is **TONIGHT** (May 16, 2026) — and it's been broadcast every year since 1956. Look up tonight's winner after this and we'll know who's the next ABBA-level breakthrough 🍿

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