You've posted about this before: that you always think Aaron comes across as too serious. But I couldn't disagree more. So, yes, he smiles and laughs in this concert and even jokes about ''Les Miz.'' He also proudly plugs ''Schmigadoon!'' To me, Aaron looked like he had a blast as Danny Bailey, and he's told various interviewers how much he loved and enjoyed doing it. His sense of humor also can be dry and deadpan, like his recent ''Miscast'' duet of ''In His Eyes'' from ''Jekyll & Hyde'' with Gavin Creel. Aaron kept a straight face throughout until he cracked up at the very end.