This November, RCA/Legacy recordings will release a four CD box set to celebrate the 50th anniversary of Elvis Presley’s ‘Nashville Cats’ sessions.

Titled From Elvis in Nashville, the collection celebrates the marathon 1970 session that led to three Elvis albums: Elvis: That's the Way It Is, Elvis Country (I'm 10,000 Years Old) and Love Letters from Elvis.

Over five days in RCA’s Studio B in Nashville, Elvis incorporated bluegrass and honky-tonk into his rock ‘n’ roll sound, producing late-career hits such as ‘Whole Lotta Shakin' Goin' On’ and ‘I’ve Lost You’.

Supporting him on the live recordings were the ‘Nashville Cats’, a legendary group of studio musicians that included multi-instrumentalist Charlie McCoy, bassist Norbert Putnam and pianist David Briggs.

The initial releases of the songs from the session were overdubbed; in the new box set, mixing from Grammy-winning sound engineer Matt Ross-Spring has returned the tracks to their original state.

The box set also comes with two discs of rare and unreleased outtakes from the sessions, which include several extended jams and the first take of the King’s iconic rendition of ‘Bridge Over Troubled Water’.

From Elvis in Nashville is set to come out on November 20 from RCA/Legacy Recordings. As a teaser, RCA released a five-minute jam on “I Watched My Hands in Muddy Water” by Cowboy Joe Babcock.

Listen to the track, which features Rock & Roll Hall of Fame guitarist James Burton, on Spotify below.