Mass changing genre?

[Kenny Pollock]

In my iTunes library, I have 800+ songs that are all the same genre (Hip Hop/Rap), but alot of them I changed genre's or I ripped from CD's in which genre was not imported or anything.

How can I change the genre for all the songs in one simple operation?

Thanks in advance.

edit:// a good select all, get info, click and pick genre did the trick