That, dear earthling, was Mozart’s Symphony #29, K. 201, the extremely effective accompaniment to Brian’s increasing agitation as he absorbs the genius of Stewie’s play. The autograph score resides in New York City’s Pierpont Morgan Library, an interesting coincidence since much of the show takes place in New York.
The 17-year-old Mozart wrote the symphony around 1773-1774. Unfortunately, I wasn’t with Mozart at the time but was on another continent attending “Tea Parties” and cool things like Continental Congresses. Oh well, too bad one can’t be everywhere. (Unless, of course, I invent cloning. If I do, I’ll instruct one of the clones to do a blog about it.)