Of these three songs, two are from Halo 3 and one is from Santana. Using only sound (i.e. without watching the video, or their titles), try and guess which is which. It might be easiest to have a friend administer this test, less you accidentally see the title of the YouTube page, which reveals the solution.

• http://www.youtube.com/watch?v=JFOJ13sw8o4#t=1m00s from 1:00 to 1:10
• http://www.youtube.com/watch?v=Tw4-hMTTSQ8#t=0m25s from 0:25 to 0:40
• http://www.youtube.com/watch?v=frntiiyoreg#t=0m05s from 0:05 to 0:50