Artist appearances at Flex concerts

No artists have performed a song with Artist: Flex (a71d2ef1-a36b-4d24-ba25-0d84cbb0d275) on stage yet. Have you seen an artist hitting the stage at a Artist: Flex (a71d2ef1-a36b-4d24-ba25-0d84cbb0d275) concert? Add or edit the setlist and help improving our statistics!