Author: liam_hockley
Date: 2008-08-11 19:10
The fifth degree of the major scale is called the "dominant" (in C Major that would be G). A "dominant 7th" is a major chord constructed from the 5th degree of the scale, with a flatted 7th added on top (G-B-D-F). Generally speaking, the dominant chord (G-B-D-F) resolves to the tonic chord (C-E-G). The reason it sounds "dominant" is because of the way it resolves: the "B" resolves up a half step to "C", which is the tonic note. The flat 7th ("F") resolves down a half step to "E", which is the third of the tonic chord. Try the "B-F" to "C-E" resolution on a piano... it will be really clear then.
As far as the diminished 7th enharmonic spelling goes, I am not sure why Klose changes the spelling. My guess would be that he was looking for an easier enharmonic spelling for students to learn, but I really don't know.
Hope this helps,
-Liam
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