1. Paul McCartney!!
2. Green Day / Kaisier Chiefs
3. Depeche Mode
Incubus
Arctic Monkeys
Katy Perry
Dave Matthews Tribute Band
Harlem Gospel Choir
and so on... Like 30 shows per day
you can try
www.pollstar.com for more
Broadway show maybe?
Or Today Show recordings if you are really on a budget (they have artists for free during summer, but it's really early, like 6 am)