A good performance is a good performance, regardless if you know the songs or not. They only play about 5 from American idiot ( usually the title track, are we the waiting, st. Jimmy, Jesus of suburbia, boulevard of brolen dreams and holiday. Some gigs might get wake me up when September ends or give me novocaine) the most excellent performances are actually ones from the new album. If anything, listen to these 3 tracks: (as they are excellent live) east Jesus nowhere, song of the century/21st century breakdown and 21 guns. Anyway, it's without a doubt you will have a great time.