This progression represents typical changes you might see on sheet music. has standard substitutions, which are commonly done by jazz artists.

See the modifications below:

Measures 1 and 2:  When a m7 and a 7 last 4 beats each, play the original chord 2 beats followed by an altered version of the chord on the remaining 2 beats in the measure making a smoother resolution: Gm7, Gm7-5,

C7, C7+5.

Measures 3 and 4:  This IIm7- V7:  Fm7-Bb7, lasts 8 beats. Compress into 4 beats leaving measure 3 empty to contain one twelve possible II -V progressions:  Gm7-C7-Fm7-Bb7.   G is a whole step above the original.

                                                                                       F#m7-B7-Fm7-Bb7.  F# is a half step above the original.

                                                                                     Dm7-A7-Fm7-Bb7.   D is a m3 below the original.

Measure 5:  In place or in addition to a Major 7, a Major 9, Major 1, Major 13 or Major 6 may be played.

Measure 6:  A Tri-tone Substitution is in place of the D7 would be Ab7.  See page 32 of "Guitar Seeds".

Measure 8:  When a V occupies 4 beats, a IIm7 can be put in front of it and then both can be altered rather than the way we did it in measures 1 and 2:   D7 becomes Am7+5 -  D7-9.

Measures 9 and 10:  When one chord lasts along time, add the IIm7 for more movement. See page 35 of "Guitar Seeds". The Diminished chord is here for the same reason. See page 37 of "Guitar Seeds".