The vocal group, Mama’s Blue Dress, will perform at 7:30 p.m., July 12, at the Arrendale Amphitheatre on the Piedmont College campus in Demorest. Mama’s Blue Dress, known for its airtight harmonies and vocal chemistry "with a touch of soul," has quickly earned a reputation as an up-and-coming, all-female country quartet. Each member is an accomplished songwriter, vocalist and multi-instrumentalist in her own right.