2-5-1 Jazz progression and modes?

Question

I am classically trained and just started looking into jazz theory. I understand that the 2-5-1 progression is a good place to start. My basic understanding is to play the above progression with arpeggios 1-3-5-7 combinations for improvisation. I also understand that 2 "types" of jazz are possible: modal or chord based. My first question is: If I am in C Ionian mode, my progression is Dm, GM, CM or any variations of these basic chords( I guess??) However, if I am in the Dorian mode(or any modes), does it change from D,G,C to E,A,D and so on through the modes?

Answer 1

I think the best way is to learn the harmony/chord function in jazz first. This will unlock you to a much bigger harmony world (not just for jazz).

Answer 2

ii-V-I progressions are not usually played in modes, but in either major or minor. Modes are used in jazz as "chord scales" (scales you use over a chord). For example D dorian can be used over Dm7. If you have a ii-V-I progression in C major (Dm7-G7-CM7) you can use D dorian over Dm7, G mixolydian over G7, and C ionian (and sometimes lydian) over CM7. Things get more complicated when there are alterations involved (such as G7#11 where you can use a mixolydian with a raised fourth). The ii-V-I progression is very common in jazz and when learning to improvise over chords practicing scales and arpeggios that run through these progressions in all keys is helpful.