Need help in identifying these two popular rock songs
 

And I mean 90s/00s metal type stuff, not classic rock. It's really annoying me as I should know clearly what they are, I've heard them so many times in the rock pubs I go to, they're obviously both well-known, no doubt by a famous band that I just haven't listened to all that often (I tend to listen to individual songs rather than bands anyway).

Here's an embarrassing video I made. First song, you might not want to have the volume too loud as my whistling may burst your eardrums. :P Second one, I hum. If anyone can answer me ASAP it would be very much appreciated. :)

first one is duality by slipknot
second one is killing in the name by rage against the machine