Not that anyone cares, but I have KavaSoft software and it counts all songs I listen to on my iTunes and gives me play counts by cd or groups. The top 20 bands in my kavasoft are:
1. Marillion
2. Unitopia
3. Beardfish
4. Steve Hackett
5. Sylvan
6. Alice Cooper
7. Galahad
8. Anathema
9. Phideaux
10. Sigur Ros
11. Dec Burke
12. IOEarth
13. Jonsi
14. Glass Hammer
15. The Black Noodle Project
16. Pink Floyd
17. Touchstone
18. Pallas
19. Spock's Beard
20. Joe Walsh
Of course actually #1 is Aural Moon, but that not a band.
http://www.kavasoft.com/KavaTunes/