Kansas - Carry on Wayward Son

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4. "Dust in the Wind" is a really good example of the "Lifeson method"...

...as I call it, of Nashville tuning. This involves double-tracking two acoustic guitars. Here's the rundown.

...Lifeson wanted to use a 12-string acoustic, but when he pulled it out of the case, it had developed a crack which affected the tone negatively. So instead, Lifeson and their producer (Terry Brown) decided to double-track two acoustic guitars, one in normal concert pitch and the other in "Nashville tuning". This is an alternate tuning where the octave strings from a 12-string set are used to replace the top four (lowest) strings on a 6-string guitar. The two tracks are then panned left and right to create a really big "12-string" out of two 6-strings.

https://www.democraticunderground.com/1034147198#post1

For some reason (studio mic technique, probably), you can't hear the super-wide 12-string effect as well as you can on the Rush song ( "Entre Nous" ). A classic, nonetheless.