A previously unreleased Eric Clapton acoustic jam is set for release next year. 'Mississippi Blues' was recorded with Tim Duffy and will be part of Blue Muse, a compilation from the Music Maker Relief Foundation.

The recording dates back to 1995, when Duffy – who'd then only recently co-founded the foundation with his wife Denise – first met Clapton.

"This particular cut began with Eric playing a slow blues in the key of A, and I backed him up with my simple rendition of the piece 'Mississippi Blues' by Willie Brown," Tim Duffy remembered on the Music Maker website. "Eric knew the tune. I told him I learned it from a Stefan Grossman recording, and Eric knew the album."