25...hmmm..

1. Dolly Parton (first show, with parents)
2. Steve Miller Band
3. Yes
4. Rush
5. Genesis
6. Billy Joel
7. Go-Go's (back in the 80s)
8. Duran Duran
9. 10,000 Maniacs (with Natalie Merchant)
10. KMFDM
11. Front 242 (twice)
12. My Life with the Thrill Kill Kult (twice)
13. 808 State
14. Echo & the Bunnymen
15. REM (twice)
16. INXS (Kick tour)
17. Loverboy
18. Pet Shop Boys
19. Crowded House
20. Charlatans
21. Social Distortion
22. Sarah McLachlan
23. Melissa Etheridge
24. Spyro Gyra
25. Sister Machine Gun

Edit to add...

26. Indigo Girls
27. Lords of Acid

Can't remember all of them.
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"Nature has constituted utility to man the standard and test of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful and consequently virtuous in one country which is injurious and vicious in another differently circumstanced" - Thomas Jefferson, moral relativist