It's kinda tricky to try to explain all this, esp. the bridge. So I'm holding off on the bridge until you guys learn what's here. You'll have to figure out the riffs yourself, but this will at least give you a starting off point. I hope it helps!! I think it's awesome that you want to learn my song(s)!
OK. So "Collide" goes something like this...
Key of D.
Chords:
verses: D (D,F#,A)/ A (C#,E,A)/ (B,D,F#)/ (B,C#,E)
chorus: right hand--G (G,B,D)/ (F#,A,D)/ Em (E,G,B)/ G (G,B,D)
left hand--(octaves) B........D...........E.............G
:? I hope I didn't just make it more difficult than it already was! lol