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FILE - In this July 31, 2016 file photo, electronic violinist Lindsey Stirling performs at Lollapalooza in Chicago. Stirling has a new album, “Brave Enough,” out on Friday, Aug. 19. (Photo by Rob Grabowski/Invision/AP, File)

FILE - In this July 31, 2016 file photo, electronic violinist Lindsey Stirling performs at Lollapalooza in Chicago. Stirling has a new album, “Brave Enough,” out on Friday, Aug. 19. (Photo by Rob Grabowski/Invision/AP, File)

Lollapalooza Festival

Lollapalooza Festival