how to figure out

I read this article, but I can't understand how to figure out the melody by the chords as it is writen in this article

GuitarPeople.com - Lessons

I know there are a fundamental rule for that, example :

for the C major scale

C, D, E, f, G, A, B, the chords will be

major, minor, minor, major, major, minor, diminished,

I read this article, but I can't understand how to figure out the melody by the chords as it is writen in this article

GuitarPeople.com - Lessons

I know there are a fundamental rule for that, example :

for the C major scale

C, D, E, f, G, A, B, the chords will be

major, minor, minor, major, major, minor, diminished,

the chords are an accompaniment.

the melody uses a lot of non-harmonic tones.

in other words, the notes of this melody are not necesssarily in the accompaniment chord.

for example, the first measure has a G7 chord (a chord a G with a seventh addaed to it, or in this case, a Dominant 7th) but the melody has passing tones of E and C. If you take both the lead and harmony parts into consideration, then you actually have a G9 chord (a dominant 9th).

I don't really understand the Bb he has in the harmony guitar part, it seems illogical to me considering the musical line and tonality in which they are playing. But then, I'm just not a bluegrass person either, so it could be some sort of stylistic thing.