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The Mix: Chicago Open Air, Chocolate Fest and more things to do in Chicago May 17-23

Top rock and metal acts perform at Chicago Open Air May 18-19. Bands include System of a Down, Tool, Ghost, The Cult, Meshuggah, Gojira, In This Moment and Beartooth. Doors open each day at 2 p.m. at south suburban SeatGeek Stadium, 7000 S. Harlem, Bridgeview. Tickets: $69.50-$249.50 (single day tickets) and $129.50-$459.50 (two day passes). For a complete schedule, visit

In 2010, Che Apalache founder Joe Troop (fiddle) moved to Argentina, where he taught bluegrass and old-time music. There he met Mexican Pau Barjau (banjo) and Argentinians Franco Martino (guitar) and Margin Bobrik (mandolin).