 Thus, Fm7 in A becomes Cm7 in A2, Bm7 becomes Fm7, E7 becomes B7, etc.In the same vein, the melody sung over A2 is identical to the A section melody, though every note is also lowered by a perfect 4th.The bridge of this piece, section B, is another example of a functional chord progression in the keys of G major and E Major.