Quick question: how do you use GWAM when not aiming at cultural victory? I get the feeling that great works don't scale nearly as well as, say, academies. So, I tend to start bulbing great writers or artists very early. If I have a wonder with a theming bonus (like Oxford), I try to fill it, but that's all. On the other hand, great writers only give about 4 turns worth of culture, and great artists' golden ages are short, so I sort of feel bad when bulbing.
As for musicians, is there any "hidden" boon to doing a concert when not going for a culture victory?