The 15th chapter in acclaimed Bootleg Series unveils 47 previously unreleased recordings, including outtakes from John Wesley Harding, Nashville Skyline and Self Portrait plus first release of fabled Bob Dylan-Johnny Cash 1969 Nashville studio sessionsIt revisits Dylan's pivotal musical journeys to Nashville, from 1967 to 1969, focusing on previously unavailable recordings made with Johnny Cash and unreleased tracks from the John Wesley Harding, Nashville Skyline, and Self Portrait sessions.

Disc One of Travelin' Thru, 1967 - 1969: The Bootleg Series Vol. 15 finds Dylan in Columbia's Studio A in Nashville recording alternate versions of compositions written for John Wesley Harding (October 17 and November 6, 1967) and Nashville Skyline (February 13-14, 1969) while introducing a new song "Western Road" (a Nashville Skyline outtake).

Discs Two and Three of Travelin' Thru are centered around Dylan's collaborations with American music icon Johnny Cash including the much sought-after Columbia Studio A sessions and on-stage performances at the Ryman Auditorium (May 1, 1969) for the recording of the premiere episode of The Johnny Cash Show (originally broadcast on ABC-TV on June 7, 1969).

Disc Three closes with tracks recorded on May 17, 1970 with Grammy Award-winning bluegrass banjo legend Earl Scruggs for the PBS television special, "Earl Scruggs: His Family and Friends" (originally aired January 1971).