I was reading Infinite Cactus's Top 50 DT thread and he mentioned that JM used an 8-string bass on Blind Faith for part of it, which is basically a 4-string with octaves added with each string, like a 12-string guitar. This got me thinking about new types of guitars.
Is there such a thing as an acoustic 7-string guitar? Or, is there a 14-string guitar, equivalent to a standard 7-string? If they haven't been invented yet, I'm sure they could be. The acoustic 7-string could be brought into folk music and add a whole other level of depth to the sound. (there's a lot of folk/country artists that pop through my town so I've always had that side of music to me.)