The Detroit Symphony Orchestra (DSO) returns to Orchestra Hall with the first performance of the 2009-10 season’s classical concerts featuring Music Director Leonard Slatkin at the podium and world-renowned violinist Midori center stage in Midori Plays Sibelius. Performances take place on Fri., Sept. 11 at 8 p.m. and Sat., Sept. 12 at 8:30 p.m. in …