The 40 Greatest Led Zeppelin Songs of All Time

The definitive guide to Zeppelin’s finest recorded moments

'What Is and What Should Never Be' (1969)
Photo by Chris Walter/Getty Images15/40

15. 'What Is and What Should Never Be' (1969)

One of Plant's earliest songwriting attempts is allegedly about an affair with his wife's younger sister. Its woozy production and bulldozer gearshifts from tender, pastoral verse to demon-steed chorus make for music strung between lover's plea and torrid fantasy.

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