Douglas,you will find IIm7 V7 I progressions in just about all music. Sometimes you will find V7 I, (G7 C)or V7 (G7 Cm)without the I chord, I normally treat them as IIm7 V7 I progression.
Example: I am playing a song in the key of C major. In that same song I see a section that is dealing with C7 and F, (V7 I in F major)I think of that part of the song as being in the key of F major. If I see Em7 A7 (IIm7 V7) without the I chord, I am now thinking the key of D major. Whenever I see a IIm7 V7 I or just IIm7 V7, I consider that a key change in the song. The color tone and key center changes telling me to
#1 improvise using a different scale.
#2 Think of the chords used in the new key even if the progression contimues one or two measures.
Putting color into a IIm7 V7 I progression.
Example:
Dm7//// G7//// C////original -- replace with:
Dm7//// Db7////Cmaj7//// IIm7 bII7 I
Dm7 ////G7//Db7// C6
Just using a bII7 chord can add so much.
Have a great day, John C.
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[This message has been edited by bruno123 (edited 01-17-2005).]