What is your favourite band of all time?

"But it tends to change on a weekly basis"
I think a favorite band of all time shouldn't change on a weekly basis. I think it should be a band that should think is great and is one of the bands you've been listening to the longest time. For me that's either the three I mentioned: Guns N' Roses (since 1991), Type O Negative (since 1994, I think) or Iron Maiden (since 1991/92). The reason why Type O Negative is featured here, is because I stopped listening to metal in '97 or something, but I never really stopped listening to Type O. When I started to listening to metal again in 2000 or something I didn't pick up any Iron Maiden or Guns N' Roses records for a year or something. It was mostly black metal I started listening to again.
If it changes on a weekly basis I would say Lee Hazlewood, John Barry, Opeth or Type O Negative, which is my favorite stuff at the moment, but not my favorite stuff of all time, as the first 3 has only been playing on my turntable for a year of two.
 
Metallica was mine for many years, but has faded to be replaced with Opeth. Emperor would possibly be one as well, but I still need years to full capture who they are, haha. I figure according to how long IX took me to really capture, it will take all their other albums that long too....