In a hard rock crossover of epic proportions, guitarist Robby Krieger of the Doors recently sat in with Alice in Chains in Los Angeles.

Krieger added some riffs to “Rooster” – a track off Alice in Chains’ 1992 LP Dirt – on August 29 at LA’s Palladium.

Alice in Chains are currently touring in support of Rainer Fog, their first LP since 2013’s The Devil Put Dinosaurs Here and third since the death of frontman Layne Staley.

For upcoming tour dates visit the Alice in Chains website.

Watch the Doors/Alice in Chains collaboration below: