The 'Musicians' episode

It was fun seeing Wierd Al Yankovic on the show but something about it kind of bugged me.

Throughout the show, most of the questions were about music and Al kicked ass (Not surpiring when you think about it. Given that his parody songs cover so many genres it would make sense that he's well-versed in many different kinds of music).

What bothered me was the fact that when they got the the "Best of 10" challenge, the questions were just of a general nature as they are on regular shows and Al didn't do so well (I forget how well he did but I know he lost to Ben). What gives?