A previously unreleased jam by Eric Clapton and Tim Duffy is set to be released next year.
'Mississippi Blues' will be part of 'Blue Muse', a compilation from the Music Maker Relief Foundation - founded by Tim Duffy in 1994 to preserve the musical traditions of USA's south.
The recording dates back to 1995 when Duffy - not long after he founded the foundation with his wife Denise - first met Eric 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. Eric knew the tune. I told him I learned it from a Stefan Grossman recording, and Eric knew the album," said Duffy.
You can listen to the track below:
The Music Maker Relief Foundation is celebrating 25 years of support for traditional blues and folk musicians, helping more than 435 artists over the years.
Duffy said his meeting with Clapton was initially about the foundation, but then "Eric noticed the 1930 Martin 00-18 sitting in the corner. He told us he had not played guitar in some months and he asked Mark if he could check it out. When Eric began to play, it was spellbinding and among the most amazing musical moments of my life. I picked up my guitar and quickly tuned it a half-step up to match his and began to play some back up guitar licks that I learned from Guitar Gabriel. After a few songs, Mark asked Eric if he would like to record a few songs."