I have a feeling Pauline's question may have been rhetorical, but well: I'd guess he started off with any of the older Mandolin Bluegrass styles and pulled out (and in) instruments as needed. For instance the guitar sounds too "tailored" to the melody to be any of the style's RT and is probably his own.
But as I say, I haven't checked his channel or anything so this is pure guesswork for fun smile


Just because you can, doesn't mean you should!
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BBox 2022 Audiophile, Mac Pro Intel, OSX 10.6.8, 800x600 (TV VGA)