Ever since joining this site, I noticed that some band pages has things spelled in British English, like instead of "color" it's spelled "colour", or if there's the word "humor", it's instead spelled "humour."

Personally, it really is annoying to see things spelled with that extra "u" inserted in (of course, I live in the US so I would say that). What is the correct way of having things be said on this site? The North American English or the British English style?

I don't know if this is such a big issue or a big deal but I thought I point it out being at most instances, I notice that a page may have under Lyrical Content to read "humor" one day, then the next being typed as "humour."

Just so you know it isn't North American English it's just U.S. English as Canadians spell it colour with a "u" and so on, and since this site is owned by two Canadians I could easily see with the "u" being more appropriate.

It doesn't matter. At all. Furthermore, it's to be expected from a site with an international userbase.

We all must put up with things we find somewhat irritating, from time to time. You have u, and I have you, too.