Hmmmmm, not sure--I don't really know anything about baritone guitars. It's probably possible, but the strings would be very floppy, and you'd have to mess with the intonation a whole lot. But "Into the Void" and a lot of other Sabbath stuff is tuned down to C#, and a baritone is in B, so I don't guess that's pushing it too much further.
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