This is from 2005 but in the three times I've been through Brussels I've found this entertaining guy earning his pay busking away.
I very much prefer Bruges over Brussels but if you're stuck in the big city there are still some useful things to see.
Bruges was definitely easier to like, and had more immediate charm, but I found myself warming up to Brussels as we figured out how to get around. We're going back around late April so I'll have a second opinion then. Btw, I just started a separate photo thread for Bruges