I think a really intense song would be "needled 24/7" it's not the hardest, but it pummels you with millions of different thoughts and feelings all at once and it really drags you into the music and makes you feel like you know what alexi is feeling while he's singing it, in addition to everyone else's playing...the emotions are just so intense its almost unbearable. It makes me really sad, really angry, and really ready to smash anything and everything...That's just me though