[link to original on tumblr]
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The bass part is more accurate, but I still don't know the little riff.
I also did the guitar and mellotron parts and a bit of the piano at the very end. I'm pretty sure that the mellotron part isn't completely accurate; I was just having fun with it. Still, I did learn that it copies the bass part during the verses.
I also realized that the chords on this are really interesting. For the verses, the first three chords are G, Em, C (though there's an Esus4 thrown in between the G and Em). Each chord has two notes in common with the next chord.
G, B, D > E, G, B
E, G, B > C, E, G
It was only through playing the guitar chords on the keyboard (my fake mellotron) that I realized this. On guitar, constituent notes of a chord are all over the place; on keyboards, they're more organized, so it's easier to see those kinds of chordal relationships.