Trad. Arr.
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Abbreviation for "traditional arrangement".
Commonly used in track listings or discography in reference to folk music where the original writer is unknown but a specific artist is identified as arranging and popularizing a version of it.
For example, from Bob Dylan's self titled album, "Man of Constant Sorrow" (Trad. Arr. Bob Dylan).
Literally meaning, "Man of Constant Sorrow" as traditionally arranged by Bob Dylan.