I haven't finished tracking this down but the episode aired in 1973, and Cash recorded "one piece at a time" in 1976. However, someone else wrote the song earlier.
I can't find a date for when the song was written, but it was apparently written for Cash, rather than him covering an earlier song, so I think MASH has precedence.
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Date: 2016-11-22 07:22 pm (UTC)no subject
Date: 2016-11-22 07:24 pm (UTC)