Definetly the start / end of octavarium... the Fm, Dbm, Eb, Abm stuff. Real nice. That coupled along with when the main theme comes in with strings, (Fm), Cm, Bbm, Fm, Eb/G, Ab, C7, Fm, Fm7/Eb, Ddim, Bdim, C7 --- and then BOOM to D minor, Csharp Minor etc... so so so nice. I asked them who wrote it when i was at a meet and greet, but was too nervous to explain the bit I meant! No one would own up haha