Best Movie Theme Tunes,

Jurassic Park has to be on the list for sure:

http://youtu.be/D8zlUUrFK-M

I have several favorite scores including:

Also Sprach Zarathrustra - 2001: A Space Odyssey
http://www.youtube.com/watch?v=SLuW-GBaJ8k

Technically a TV score but.. I Am the Doctor - Doctor Who (Series 5)
http://www.youtube.com/watch?v=5D-QPDGhCtM

Enterprising Young Men - Star Trek (2009)
http://www.youtube.com/watch?v=EMu5jP2-c5U

(Removed by Lee (Max 3 videos per thread)

Pirates of the Caribbean theme obvs

Pretty much anything by Hans Zimmer. They're not really tunes but a few songs from soundtracks that sprang to mind that haven't been mentioned:
http://www.youtube.com/watch?v=CUhvGut8C3M
http://www.youtube.com/watch?v=v_U4in8WeS0
http://www.youtube.com/watch?v=-U1mvtkqXK4