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The bVII or dominant bVII7 chord often comes from the mixolydian mode. Many bluegrass and rock and roll songs are written in the mixolydian and not in the major mode (or ionian mode, or major key, or major scale). In the key of C, the mixolydian scale is C D E F G A Bb C. So the chord is built on the note Bb in this mode. Since there is only one note ...

So, the chord sequence is maybe Cmaj / Bbmaj / Fmaj. The Bb is subdominant of the (subdominant of C) Fmaj. It's sort of reverse ii - V - I that jazzers are renowned to use.As actually many, many songs utilise. The Bb chord , in a way, is related to the key of C in a 'first- removed' manner.You're right in that the resolution is in 2 plagal cadences, so it ...