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September 24, 2016

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Mark Seliger and Michael Duff perform at "Simon Says Fight MSA" benefit concert at The Keep Memory Alive Center in Las Vegas on Feb. 27, 2014.

Denise Truscello/WireImage

Mark Seliger and Michael Duff perform at "Simon Says Fight MSA" benefit concert at The Keep Memory Alive Center in Las Vegas on Feb. 27, 2014.