By Don Heckman Los Angeles – Aug. 31. (Tues.)  The Karen Lovely Band. Rising vocal star Lovely is applying her powerful singing to classic blues, richly investing the  styles of the ’30s and ’40s — Ma Rainey, Bessie Smith, etc. — with her uniquely contemporary perspective.   Vibrato Grill Jazz…etc. (310) 474-9400. – Aug. 31.… Read More Picks of the Week: Aug. 30 – Sept. 5