In the early 1970s, the European music scene was a landscape of stark contrasts: the rigid, mathematical beauty of the classical conservatories on one side, and the loud, experimental noise of the underground on the other. Most artists were content to stay in their lanes, but the Dutch band Focus saw the recording studio not as a workplace, but as a laboratory for high-stakes creative adventures. Their leader, Thijs van Leer, was a multi-instrumentalist who didn’t believe in “sides”.

In 1971, this philosophy resulted in “Hocus Pocus”. At its core, the song was a massive risk—a seven-minute instrumental built on a heavy, ear-splitting rock riff that felt both ancient and futuristic. But in the middle of this high-volume recording, Van Leer decided to insert a full-scale, “heavy metal yodel”. He wasn’t just looking for a new hook; he was looking for a technical collision.

He took the folk-rooted art of yodeling and smashed it into the distorted energy of the burgeoning prog-rock scene. His bandmates watched as Van Leer layered flute trills, accordion bursts, and falsetto shrieks over Jan Akkerman’s crushing guitar lines. It was a maverick recording—unpredictable, dense, and demanding. Radio programmers had no idea how to handle “heavy metal yodeling,” yet for those who stayed for the full duration, the reward was a technical epiphany. It proved that rock music could handle the weight of total absurdity without losing its grit.