A clearer version and longer version of "the Mission Suite" can be found here:    • John Williams - The Mission Suite Mov...  ". The Mission Suite was written by John Williams in 1985 for NBC. Various programs have used parts of the suite as their theme, including NBC Nightly News, Today, Meet the Press, NBC Special Report, and others. The Mission consists of four movements:

0:00 I. The Mission
3:28 II. Fugue for Changing Times
5:24 III. Scherzo for Today
7:16 IV. The Pulse of Events

For as well-known as John Williams and NBC News are, I was surprised I couldn't find the complete suite together anywhere on YouTube. I was also surprised that I couldn't find any good audio for Scherzo for Today, in particular.

The suite is a masterpiece, and in my opinion, the best set of TV themes ever written. I thought it deserved to be heard in its entirety, so I compiled them together myself with the best audio quality possible. Enjoy!