That's the key!
He "sped up" the Blues and added in Scotts-Irish Fiddle tunes, Swing-style bass, country guitar, and Earl's driving banjo. If you think about accenting on beats 2 & 4 in a typical 1-4-5 blues number, that's rhythmically what the mandolin chop is doing, albeit at warp speed compared to most blues.
Bill Monroe's solo licks, at least to me though, just ooze blues...Take "Lonesome Moonlight Waltz" for example. To me it's a great blues-melody put to waltz-time; which I would never dream of doing...but that melody line to me is straight up blues.
Fascinating stuff!
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