So I have been playing guitar for a long time, but only recently have begun to seriously dive in to music theory. I have limited knowledge, so little that I am unaware if this is a very simple question and maybe I am just missing the obvious.
I am working out of a guitar fretboard theory book, and they give a chord progression: Fmin7 / Bb7 / Fmin7 / C7
And then they go on to say that you could solo over this with the F Dorian mode. I can not see why Dorian would be chosen. From what little I know, the Dominant 7th is the 5th degree of of the Ionian, or in this case the 4th degree of the Dorian, which makes sense in the case of F Dorian we would see the Bb7 chord. But where does the C7 come from? Shouldn't the 5th degree seventh chord of F Dorian be a Cmin7? The C7 has a natural E while the Cmin7 and F Dorian both share an Eb. I was also under the impression that there was usually only one scale degree that was dominant, i.e. fifth degree of Ionian.