Just to clear up what DDY songs Styx has played since the split (because I know too much about the subject)....
Styx played Babe once in 1999 for some reason, I think the venue requested it and they booked the show before Dennis was gone or something like that. They also played an abridged Best of Times in their acoustic set throughout 1999, and a small portion of Mr Roboto in the middle of Edge of the Century '99-2000, and the first lines of Mr Roboto in their Borrowed Time Medley (2001 and 2010) and their 18-song medley (2003-08).
They have played Lady, Grand Illusion, Come Sail Away at every single show '99-current (there could be some exception I don't know of) and Lorelei almost every show 99-2015 and sometimes now, Rockin the Paradise at most '99-2001 and every show since late 2011, and always Light Up 2013-current. They've also done: Suite Madame Blue, Castle Walls, I'm Okay, The Message/Lords of the Ring, Queen of Spades, Pieces of Eight, Borrowed Time (most of it) fairly regularly on certain tours.