Artist appearances at Flex Progression concerts

No artists have performed a song with Artist: Flex Progression (5b00b020-899d-4834-a08e-0943277b1eff) on stage yet. Have you seen an artist hitting the stage at a Artist: Flex Progression (5b00b020-899d-4834-a08e-0943277b1eff) concert? Add or edit the setlist and help improving our statistics!