Either the radio music or backround music?

First off I think the Lonesome Road trailer re-defined https://www.youtube.com/watch?v=WB5VnEo2604 and I can hardly listen to the think without imagining Ulysses voice.

https://www.youtube.com/watch?v=0w-LZrSPs5Y ABSOLUTELY set the tone for meeting House for the first time and receiving a barrage of interesting information to satisfy your every curiousity.

Nothing says "stand aside Profligate" like the very theme of https://www.youtube.com/watch?v=LnWxGoQwyVw

And https://www.youtube.com/watch?v=yIbO-tntjwk and https://www.youtube.com/watch?v=nObOHVx_1W4 https://www.youtube.com/watch?v=x9gKSVy9yvk of it are equally as awesome.

And https://www.youtube.com/watch?v=c5PzaJELAJI marked the ending of the greatest game ever made.

There's many more though, and I wanna hear which ones are your favorites.