Also, you might want to look at the tag %albumartistsort%. This will get you your "Beatles, The", but it will also get "Dylan, Bob". You don't mention whether you want individuals sorted this way, but I thought I'd mention it just in case.
The problem with sorting by genre, is there's no guarantee that all the songs on a particular album are going to have the same genre. Genre tags in MB are pretty chaotic, so you may end up with an album's tracks split up over multiple genres.