For formal concert gigs, I'll usually put together a set list, yet never hesitate to veer from it as the mood strikes, to satisfy an audience song request, or sudden change of heart. For restaurant, bar & party work, I spontaneously wing it according to the mood of room, though I may, on the way to the gig (go over in my mind) a list of songs I might be in the mood for playing that evening. This brings up the advantage of the Music Finder feature on Yamaha arranger keyboards. I'm able to scan/search/peruse all 550 songs included in my custom selected core repetoire at a moments notice, and call up the appropriate style & instrument setup at a moment's notice. The Music Finder really is an asset for quick spontaneous playing. - Scott