This allows the rhythm section to have an interesting chordal movement and yet allows the melody to remain very closely related to the Em tonal center. The Bm7 chord gives us the need to resolve back to Em but also shares several common tones with the Em7 chord. The Bm7 chord acts as a dominant chord in this context but with an added benefit. There is a chord (B7) that would arguably create a stronger need to resolve but it is not used in this case. ![]() What makes the Bm7 so interesting is that it creates one of the strongest pulls back to the Em7 chord. All other chords will want to resolve back to Em. Hence all other notes in the melody will want to resolve back to the Note E. It only takes a moment and we naturally feel like Em is home. In this song the Em7 chord establishes the tonal center for our ears. In particular, the relationship of these 2 chords is significant. ![]() The melody works fine over a continuous Em chord - but it would have the tendency to drone after a while - nothing interesting is happening for the melody to work against. This is more interesting than vamping over a single chord.
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