Ok I just finished my first week of Guitar Chords 101 at Berkley School of Music (The online Course) and I am a little confused on a couple of things. On the Circle of 4ths (I know this is also the circle of 5ths if you go clockwise.) I am trying to figure out why it goes C, F, Bb......why Bb and not B? I am sure there is an obvious reason but I have not been able to figure it out.