Parapharased from Wikipedia:
The theme music to Countdown with Keith Olbermann is the opening eight beats of the second movement, a scherzo, of Ludwig van Beethoven’s Symphony No. 9 in D Minor, Op. 125, the “Choral”. The theme is a historical reference to NBC’s pioneering newscast Huntley-Brinkley Report with Chet Huntley and David Brinkley, which featured the scherzo of Beethoven’s 9th over the credits.