When the Beatles took the stage fifty years ago today (Oct. 13 -- ignore the date on this video) to appear on the variety show 'Sunday Night at the London Palladium,' they were four lads armed with the simple tools of their early classics--a bass, two guitars, drum kit.

The psychedelia, the massive studio productions, the brilliance and adoration, suspicion and disintegration -- those were years away. In this moment, cited widely as the birth of Beatlemania, it was simply John, Paul, George and Ringo, setting their homeland on fire.

The Beatles' first smash single in the UK, 'Please Please Me,' hit No. 1 on the charts in early 1963; a full-length LP of the same name was released in March. 'From Me To You' and 'She Loves You' came next. When the Fabs appeared on the Palladium telecast, they had already completed three tours of the UK that year; a fourth would begin on November 1.

In other words, this was a country primed to explode with mania over these four guys. It was the insanity surrounding this single TV appearance that brought the group fully to the attention of the national media and inspired newspapers to invent the term "Beatlemania" to describe this phenomenon. It was unique at the time, mobs of teenage girls filling the streets and caterwauling on Sunday night television over a pop group. Since then, we've seen everyone from Leif Garrett to Justin Bieber inspire similar squeals; it all began in London fifty years ago today.

Naturally, you can find the full performance on YouTube (or at least the audio), and it's like a strange transmission from another planet. There's the constant buzz of teenage screams over everything, then what sounds like cavemen beating on rocks to the ear of a modern listener. There's the brute force of hard-earned experience in their licks and riffs, honed playing multi-hour sets in the rock clubs of Hamburg, Germany.

The Beatles weren't innovators in 1963, though they soon would be. They were using the same building blocks that birthed Chuck Berry, Bill Haley, and Elvis Presley. It was the blues, soul, gospel, and a sprinkle of pop showmanship for extra added spice. Still, when the Beatles brought those ingredients together, something new emerged, something primal. It's the sound of modern pop music being forcefully willed into existence.

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