Performances: This year’s concert series highlights the unpredictable, improvisational nature of jazz music with performances by a number of diverse artists.   Saturday, January 5, 2002, JBL Theater, 8:30 p.m. An Evening with Joanne Brackeen Joanne Brackeen is a virtuosic pianist and master composer whose original work epitomizes the evolution of jazz, from traditional to free and everything in between. Brackeen has worked with and apprenticed under the wo …