bapu
@Voda, So then every i v vii blues song is a ripoff?
No, but I think the opposing logic is problematic too. Can I not ripoff a single chord progression in all of music history? There's not one song I could totally copy in terms of chords and progressions and that's not a ripoff at all?
Are modified chords simply a chord with a melodic note? Or are they part of the common material? I can play a unique set of modified chords that can have quite a signature about them, and that would seem inadequate to say that doesn't make it a song, and yet, I concede it's still just a pile of chords that someone else could put another melody over and perhaps be a different song.
I don't have strong opinions on the subject, I'm just spitballing and stumbling my way in the dark here.