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Chris Brown performs at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Chris Brown performs at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Chris Brown performs at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Chris Brown performs at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Chris Brown performs at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Trey Songz performs at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Trey Songz performs at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Fans take in a concert by Chris Brown and Trey Songz at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Fans take in a concert by Chris Brown and Trey Songz at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Fans take in a concert by Chris Brown and Trey Songz at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015

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Fans take in a concert by Chris Brown and Trey Songz at Allstate Arena in Rosemont on Friday, Feb. 27, 2015. — Chris Sweda, Chicago Tribune, Feb. 27, 2015