The theme comes from the soundtrack to the 2000 movie Requiem for a Dream, composed by Clint Mansell. The main theme is entitled "Lux Aeterna".
The theme's popularity led it to be re-orchestrated for the 12 minutes trailers for The Lord of the Rings: The Two Towers. In honor of the theme's origins, it was entitled "Requiem for a Tower" - this is probably the version that you know best with full orchestra and choir.
The song in the Telus monkey commercial is called "Do Your Thing" by Basement Jaxx.
The Answer by Josh Schroeder
"The Song" by Emilie Mover - that's what I found on youtube.
martell by the cribs is the song
The song is Misirlou by Dick Dale and his Deltones
The Answer by Josh Schroeder
The song in the new Telus commercial is "Under the Milky Way" by The Church.
Jump around by House of Pain
its by MAjor MAker
The song is by Anjulie's - called Jamba
The song is called "Martell" by "The Cribs".
Try this site for song commercial names and artists: http://www.songtitle.info/