In a new interview with Guitar World, Soundgarden guitarist, Kim Thayil, looks back on his most iconic riffs and solos, as well as the gear and tunings that guided him deep into the creative superunknown. An excerpt from the feature follows...

With the sixth string detuned a whole step to allow for one-finger power chords, its sound leant to a meatier and more muscular whirlwind of noise, inspiring some of the band’s most famous tracks such as "Outshined", "Spoonman" and "Jesus Christ Pose" – anthems that, it’s worth noting, wouldn’t have sounded quite the same in standard.

“I can’t say we invented or designed these tunings,” Thayil says while sipping coffee out of a white Scrabble mug on a humid summer’s day at home in Seattle. “You’d hear stories about players like Keith Richards playing in open [tuning] and maybe only using five strings instead of six. I also remember reading about Kiss dropping their guitars half a step down and realizing a lot of rock players were doing that.”

By his own admission, his first adventures in drop D felt “kinda weird.” Early on, he’d ask himself why guitarists were purposefully choosing to play an instrument that tuned incorrectly, at least in the conventional sense. And then, of course, those lightbulb moments he built a career out of started arriving thick and fast.

“When you’re learning, you start orienting toward what you are told is correct, but then you go on and liberate yourself from those constraints,” Thayil says. “Yes, there’s a common rule of thumb for tuning guitars, but there are other ways to approach it to facilitate playing or writing, or even just to change the tone. You loosen a string and get a different sort of sound… you can bend more, thanks to the extra floppiness!”

Guitar World: It almost feels like songs like "Outshined" simply wouldn’t have existed in standard.

Kim Thayil: “Heavy metal and drop-D is a match made in heaven… it just works. Then Chris started dropping his sixth string even further down to B, writing songs like 'Rusty Cage' during the Badmotorfinger era. By doing that, we could make the octave by fretting up a whole step on the next string along… which sounded cool! So messing with tunings definitely spawned a lot of stuff."

Read the full feature at GuitarWorld.com.