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The other version seems fairly off, so here's the real deal: The song's in Fm, so just put a capo on the first fret and play in the key of Em, just like the guy (or girl) who played this on the recording. Or tune the guitar up one half step. To view the simpler chords just select "Transpose Down 1 Half Step" on the upper right area of this page.
Come Fmgather 'round children, It's Ebhigh time ye learned, 'Bout a Fmhero named Homer And a Ebdevil named FmBurns.
FmWe'll march till we drop, The Ebgirls and the fellas, We'll Fmfight till the death Or else Ebfold like Fmumbrellas.
So we'll Abmarch day and night, By the Ebbig cooling tower, FmThey have the plant, Eb Fm (last time last chord is Bb, not Fm) But we have the power.
Ends in Fm. P.s. if you have capo 1st fret play the now 2nd fret on the low E-string right before the chorus (sounding tone is G). Now do "Classical Gas"!