IMac :: Change Album Of Track Without Opening ITunes - Easy On Windows

I have a folder with maybe 20 or 30 songs by mobb deep. I want them to be part of an album called "mobb deep", but the majority of these songs are from different albums and mixtapes, and most doesn't even have the album title on them. So on Windows I would simply mark all the files in the folder and right click, hit properties and then I'd be able to type in an album name. First of all when I mark 20 files on Mac and right click it'll open 20 windows instead of one window for all of the files (one of the dumbest things on OSX, I love everything else but this is mad stupid) - second of all I don't even think it's possible to type in the album name when right clicking an mp3 file. So how can I change the album title on all of these files without doing it in iTunes? Reason I aint doing it in iTunes is that it'll be a pain to locate each song in there since they'll be labeled all wrong.