Keith Richards has unveiled a viral campaign for fans looking to get an early taste of his upcoming album Crosseyed Heart.

Richards is placing four temporary plaques in London, each "celebrating a site of significance to the Rolling Stones guitarist's life."

Richards will share the locations via Twitter and Facebook for fans to find.

Each plaque has a unique password to be submitted at the Crosseyed Heart website, and each password unlocks one song.

Fans have already unlocked the first song, "Amnesia," and the second location will be tweeted out on August 24.

The location of the first plaque was 6 Spielman Road in the Dartford section of London, which is where Richards lived as a teenager.

Crosseyed Heart lands September 18.