By Denny Dyroff, Entertainment Editor, The Times Maci Miller Maci Miller, one of the Delaware Valley’s premier jazz singers, is known for her topflight albums and her spellbinding club dates. This week, Miller will perform an infrequent theater concert here in Chester County. On September 21, Uptown! Knauer Performing Arts Center (226 North High Street, West Chester, www.uptownwestchester.org) will...