This is a progressive rock classic from the 1970s. Key of em. I've always enjoyed the melody and minor key setting of this awesome tune... and minor tunes typically sound great on the banjo... so, why not? There is solo Scruggs work in this arrangement...which adds to th effect of the tune itself, in my opinion, but there is also a fair amount of chord work...for the banjo player to master. I say master, because you have to be able to move 4-string chords quickly. Great tune. Sounds excellent in play-back mode in Tabledit. 

Tom