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Retrograss is a bluegrass album by David Grisman, John Hartford and Mike Seeger. It was released on the Acoustic Disc record label in 1999. For the 2000 Grammy Awards, Retrograss received a nomination for Best Traditional Folk Album. From Wikipedia (https://en.wikipedia.org/wiki/Retrograss) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)