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Johnson Street Underground is a dynamic, a cappella quartet from Winona. Their repertoire covers the gamut from Adele and Billy Joel to Sting and Mumford & Sons. The group formed in January 2018 for the love of close harmonies, without instruments! JSU has entertained crowds at various venues and events in the area since then.  The members are Matt Schultz, Seth Flatten, Charlie Opatz, and John Chernega.