Because they're in wildly different tunings that the transcriber probably doesn't want to go "out of their element" and figure it out? Because their might not be as big as a market as what you might think, or at least enough to register the space in the magazine?
The tabs on this site and elsewhere are either great or give you a decent idea on what to play around with.
Additionally, Thurston said the band doesn't write any music down, they just try to remember it. This actually posed a couple problems during the DDN tour as Thurston couldn't remember some of the parts he had.
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