"Singing in Viet Nam Talking Blues" (or "Singin' in Viet Nam Talkin' Blues") is a song written and originally recorded by Johnny Cash.
Released in May 1971 as the second single (Columbia 4-45393, with "You've Got a New Light Shining" on the opposite side) from Cash's that year's album Man in Black, the song reached #18 on U.S. Billboard country chart and #124 on Billboards Bubbling Under the Hot 100.