Do you want to play really really downtuned metal? If so then it means you can take it as low as drop A without breaking sweat. So a whole 5th lower than a six string in drop D. Or you can use it more creatively and use extended or split tunings on a seven string. The downside is that they look ugly as hell. Alternatively you could try and find a Baritone guitar which is basically a six string with a longer scale that is usually strung B - B
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