Some fans point to “Stairway to Heaven” as Led Zeppelin’s defining moment. The Led Zeppelin IV centerpiece is the band’s most-streamed song on Spotify. Yet Plant and guitarist Jimmy Page say “Kashmir” ...

Now, a priceless piece of that rich history is up for auction: next month, through Julien’s Auction, the original, handwritten lyrics for “Kashmir” will go for sale. The sheets—written on stationery ...