IMO, I think the best plan of attack is a mostly static set, for the new material and some rarer, deeper cuts, and then pick 6 or 7 classic songs and swap those each night. For example, let's say they play 20 songs a night during a tour. The classic songs they tend to play the most are Pull Me Under, Metropolis, Spirit Carries On, Under A Glass Moon, Take the Time, Lie, Strange Deja Vu, Learning to Live, Another Day, and Surrounded, according to setlist.fm. So, for Setlist A, maybe they'll do PMU, UAGM, Another Day, Strange Deja Vu and Take the Time. Then Setlist B will fill those spots with Metropolis, Spirit, Lie, Learning to Live and Surrounded, and that way everyone will get to see the rarer songs, but not have to worry about seeing the same 8-10 songs every tour cycle, with a few new songs and 2 or 3 rarer ones.