So I've been practicing over one of my favorite type of progressions out there; a Jazz Rock Fusion backing track that modulates from Cm, to Dm and then to Ebm. I'm just alternating between C minor (C aeolian), D minor (D aeolian) and Eb minor (Eb aeolian). I also figured out a cool way to improvise using sweep picking with some chord voicings that I usually use for comping. I love the sound of constant structure chord progressions and improvising over them. Enjoy!