Two Five Progressions

Two five progressions are very common in jazz.  "Two five" means the 2nd chord in a key, followed by the 5th chord in a key.  For example:  In the key of C, the chords are: CMaj Dm7 Em7 FMaj G7 Am7 Bm7b5.  Therefore, a I IV II V I progression (1 6 2 5 1) in C Major would be: CMaj Em7 Dm7 CMaj.  I IV II V I is a common intro.  The following exercise cycles through II IVs every key.

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