Apologies for the title which is even worse than usual...
I like this idea very much. It's a set of maps which are based on the concerts that were given by U2.
They are separated out by decade.
This could be adapted for other bands. There are various databases online for different groups, such as the Concert Database.
U2 Concert Mapping is the post on e-Spatial.
Which is another chance for me to mention how disappointed I was by the disappearance of Gracenote Music Mapping.