re: Stoner Metal/Sludge/Doom/Post-metal/Blues Rock/Psychedelia

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Let the debate rage on

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I agree, there's much overlap, much common ground and plenty of opportunity to split hairs.

IMHO, the use of the C# tuning first used by Iommi on Master of Reality is quite important, because, in order to use that tuning scheme, you may need to conduct some other guitar adjustments, besides just turning the machine heads. You may need to adjust the bridge and intonate after downtuning. That's why this was a radical innovation -- it was complex and more involved than the classic blues innovation of tuning down only one step to E flat, like Jimi Hendrix.

It's also interesting that the classic Fu Manchu guitar sound is made with one single coil pickup. Tony Iommi's classic guitar sound on the first three albums is also made with, not a humbucker, but with single coil pickups.

You'd think that the guitarist would want the hottest, heaviest double coil PUPs for the genre, but, this is not necessarily so. The single coil sound works.