As Radiohead work on new songs for their upcoming 2012 tour, supposedly older material attributed to the band keeps surfacing online. Last month it was a pair of tracks said to date back to the now British art-rock giants’ first demo tape. Now, what appears to be an unreleased Radiohead demo from the early to mid-’90s has hit the Web.

“Putting Ketchup in the Fridge,” as the latest track is purportedly titled, puts a soaring, Thom Yorke-like vocal over shuffling drums, languidly elegant guitars, and an anthemic bass line. As Radiohead fan blog At Ease points out, a pretty good comparison is “How Can You Be Sure?”, a killer B-side from 1995’s hugely influential The Bends. There’s even a similar question-as-chorus: “How do you sit still?”

Of course, there’s no confirmation yet from the Radiohead camp. The source of the leak is reputed to be a former EMI executive, which, if true, would surely lend the track some veracity. Like the song says, though, how can you be sure? A lot of people have tried to sound like The Bends-era Radiohead. Listen to this one below: