I know this is not really a Band in the box questions, but there are enought knowledable people here that perhaps someone won't mind addressing it.

I recently purchased a master class Jazz program that gets into basic Jazz. One of the pieces has a progression as follows:

DM7 G7 CMaj7 F7 Em7 A7
Dm7 G7 Dm7 G7 Em7 A7 Em7 A7
Am7 D7 Abm7 Db7 CMaj7 F7 Em7 A7

The Key appears to be C because there are no sharps or flats. But if it is in C it is confusing because the first chord that's played is DM and although at the very end it appears to end on a C6, if the key is C, I would expect it to end of a C Major. It looks to me to be more like in the Key of D or D minor because of the repeating A7 the D7 pattern (A7 being the 5th of D).

At any rate, I am not really familiar with Jazz idioms. I am used to dealing with Major keys and occasionally minor keys. I know it helps me to have a handle on what any piece is doing. It helps to see, for example a six two five one progression, but I don't understand what this piece of music is doing. What kind of mode or progression might this be. What key does it appear to be in?

Anyone?

Woody - Sacramento