The dreamy, vocal-like intro that 'talks' the title — a guitar fed through a Kustom 'The Bag' talk box, with Perry mouthing the vowels into a vocal mic. Underneath is a Strat into a hot Ampeg V-2, with an early Eventide DDL adding short stereo slap. The descending main riff hits clean and mean. The signature is the talk box plus the studio's tight ambience, not high gain.
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David Gilmour's Pink Floyd tone decoded: amp settings, Big Muff dials, delay chains, and song settings for Comfortably Numb, Time, and Shine On.
Jimi Hendrix fuzz tone: Fuzz Face settings, the guitar volume cleanup trick, Marshall amp dials, and how to nail it on modern gear.