I am especially excited by multi lateral improvisation, as I call it when a player improvises many musical parts at the same time – as opposed to simply improvising a melody over a given background. In this performance I use live looping, which means I record phrases I play and then keep changing those recordings while playing an additional part. So there is no “lead” and no “background” part of this improvisation. I do not play melodies and improvise chords to back melody up, nor do I play chords and improvise melodies that fit in. I invent all parts of the music at once. This is not “free improvisation” because in order to sound like some sort of music, although weird, everything has to relate to some common ground. The common ground in this particular performance is parallel transposition of minor chords. In this case using only the tonica, first, second fourth and sixth position transposition diminishes the palette further and creates a musical universe where almost anything can be played and still turn out harmonic.

The looping technique used here is to start out by playing an instrument and recording it as a very long loop. Careful to initially play only notes that will work harmonically even if transposed (thinking not only about actual sound here but also about what scales any given future transposition of the recorded loop may imply). So as lungs go empty of air I close the loop and it starts repeating. Now I use foot pedals to shift speed/pitch of this long loop into different intervals while I play along. Manipulating transposition of the recorded loop is one orchestral element and my live instrument is a second – both elements are parts of the same improvisation. This is a simple technical praxis of what I call multi lateral improvisation. If transposing a musical part in minor you get totally different harmonic scale options for your playing compared to transposing a musical part in major. It can easily become too complex to sound interesting so the challenge is, in my opinion, to find themes and refine them.

Composers use similar theoretical rules to create scores, but to me in this moment of time it is more fun to work out techniques that allow you to do it all at once in sound!

(edit)
Since publishing I have received some questions on what software were used in this performance, so here we go: Mainstage by Apple is the “effect rack”, “mixer” and “patchbay”. Inside Mainstage I am running the AU plugin version of the looper Mobius. As soon as the first loop is recorded Mobius calculates the musical tempo I am playing in and sends out MIDI Clock which Mainstage adapts its tempo to. This makes tempo dependent effects follow my playing/live looping. Maybe I should also mention that the video doesn’t cover the extensive foot work done to simultaneously play Mobius from a Behringer FCB1010 MIDI pedal board. There are almost as many looping commands happening as there are notes played in this performance.

The audio sensitive live graphics are simply the iTunes Visualizer