Soundgarden opened a portal into the '80s a couple of weeks ago with the release of rare song "Storm," and the Seattle grunge gods keep leaking more old material into the world prior to their forthcoming box set, Echo of Miles: Scattered Tracks Across the Path (out Nov. 24).

Friday's release is a cover of Sly and the Family Stone's "Thank You (Falettinme Be Mice Elf Again)" that 'Garden performed on BBC Radio in 1989.

More straightforward than most of their stuff, the track features Chris Cornell's signature wailing and a shredded guitar solo from Kim Thayil.

Check it out:

Cornell talked to Rolling Stone about new music in May, and discussed the history of grunge rock.

"We're clearly pioneers of that genre," he said. "So imagining that we weren't part of it, if we were from somewhere else, when that story is told we would not have been part of it. That comparison could be Jane's Addiction or Smashing Pumpkins, who won't necessarily get mentioned when some new rock fan is researching these dramatic pivotal moments. So for that reason I feel whatever we had to put up with over the years, all the Seattle questions, it's worth it."

When can we expect more product, dude?

"Literally, in the last couple days, I started coming up with ideas for songs for a new album. I can't describe the direction it's taking, though. There's no album we've ever made where I would have been able to describe a direction it was taking while making it. Like Superunknown, I understood what it was near the end. King Animal [Soundgarden's most recent album] was that way, too. I really didn't understand the personality of the record until it was almost finished. Then I thought, 'Oh, it's this. Awesome.'"

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