This article tells the wonderful story of how a mathematician helped restore a bootleg recording of Woody Guthrie performing live. Until recently no such recordings were thought to exist, but in 2001 one appeared. The problem was, it was recorded on flimsy wire that was stretched and twisted. The restoration was so good that the recording has been nominated for a Grammy.
http://www.sciencenews.org/articles/20080209/mathtrek.asp
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