In the next link Tony Rice is playing in his first chord sequence Am - G - C - D. The song and the sequence is in the key of D. In the Key of D (tonic) we have A(major) as the dominant and G(major) as the subdominant, then C must be a borrowed chord making it a bVII chord, am I right? In the Chord sequence played by Tony Rice he plays an Aminor as the fifth chord, why does that work?
He also notes he got that sequence from Claude Debussy, a profound user of tritone and whole tone scale. And that's all I know about him.
Can somebody tell me how such sequence (Vm-IV-bVII-I) works? Or am I on the wrong path?
Here's the link: