Watch the Extended Performance online guitar lesson by John Stowell from Modern Chord Melody
In my performance, I'm employing many of the same devices and techniques that I use during the statement of the melody. Note the use of open strings in my improvisation, both in the chords and single lines. I'm moving between time and rubato playing, and occasionally playing in a pulse-without-meter format that I mentioned earlier. This creates a different kind of open time feel that I enjoy using, and I employ it pretty often when I'm playing solo.
I've also tried this approach with some duos and trios; it's a bit unnerving initially attempting to play over a set of changes in a group when no fixed meter is present. Over time (excuse the pun), you get accustomed to moving at a slightly different pace through the harmony than your bandmates. This approach fine-tunes your listening skills and ability to communicate your melodic intentions to others in the group.