More than a few people in Nashville, Tenn., wondered what was up when rock legend Robert Plant was spotted in recent months at the Grand Ole Opry and at the popular bluegrass club The Station Inn.

The former Led Zeppelin frontman's album with bluegrass star Alison Krauss, "Raising Sand," will be released Oct. 23 on Rounder Records, the label announced Friday.

Recorded in Nashville and Los Angeles and produced by T Bone Burnett, the album finds the two interpreting lesser-known material from blues, R&B, country and folk songwriters.

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"You've got two singers that can handle a wide range of material — storytellers. So you look for the stories," Burnett said in the release.

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