Example:

Aerosmith

+Beach Boys
-Apparel
-Novelties
-Tour Memorabilia
-other
-Posters

+Beatles
-Apparel
-Novelties
-Tour Memorabilia
-other
-Posters

Doors

Duran Duran

+Pink Floyd
-Apparel
-Novelties
-Tour Memorabilia
-other
-Posters

+Presley, Elvis
-Apparel
-Novelties
-Tour Memorabilia
-other
-Posters

Radiohead