 Tomorrow evening, the Emerging Artist Monday series continues with a performance by keyboard player Chan Hall. Tuesday at Blues Alley, The Bone Shakers. Wednesday, singer Robert E. Person. Thursday and Friday, the music of Nina Simone, presented by vocalist Carol Riddick and bassist Gerald Veasley. And Saturday and next Sunday, Tuck and Patty, guitar and voice. At Blues Alley, 1073 Wisconsin Avenue, NW,