The most common alterations you’ll find on the ii-V-I progression will be over the Dominant (V7) chord. With only slight alterations to the rootless 4-note voicings previously posted, we can cover a number of common Altered Dominants, including V7(b9, 13), V7(9, b13), and V7(b9b13). Maybe in a later post I’ll address some improvisation options over these various alterations, but for the time being, start to experiment by substituting these alterations into your major ii-V-I’s. Check out both inversions of each alteration – the voicings sound a little different with the altered note on the top of the voicing or with the altered voice in the middle of the voicing. And you can use the Drop-2 technique to quickly and easily turn these into two-handed voicings.