Harmonic graphics in Hackney,London

Hallo tuning folk,

This is to inform especially Britisher tuning group members of an 8 hour
event on 19
November at the Round Chapel in Hackney, North London, in the UK. There will
be five sets of music played by the internationally acclaimed keyboard
sextet Piano Circus, featuring music by Regimentas Petronis, Steve Reich,
Lawrence Ball (myself), Patrick Nunn, Martyn Harry, Conlon Nancarrow, Terry
Riley, Erki Sven-Tuur and Jean Catoire.

The Round Chapel, 1d Glenarm Rd., London E5 3PM - 11PM
admission £12 concessions £8
Refreshments and food will be available throughout this event.

The music will be presented with a projected series of moving colour
sequences generated live by computer software developed by myself and
VR-researcher Dave Snowdon, based on Harmonic Mathematics, a development and
further evolution of John Whitney's Differential Dynamics, which was worked
on by quantum chemist/physicist Michael Tusch and myself when I was his
A-level (age 17-19 for you Americans) private maths tutor in the mid 80s.

This form of graphics generation utilises harmonics not as sounds
necessarily, but harmonics of speed of movement (different elements of an
image moving at different, harmonically related speeds - harmonics from 1 to
hundreds) or latterly, harmonics of speed of transition through a look up
table holding a "timbre", i.e. speed of movement through a sequence of
smoothly connected positions. The result can be outrageously satisfying to
watch, perhaps what a creature who could perceive time very slowly indeed
would experience on hearing a perfectly tuned chord, (if they could see air
pressure waves).

I wrote some references about Harmonic Mathematics which are in the archives
of the
Algorithmic Composition group 'Algo-Comp' (its an egroup- I think they're in
digests 10 and 13), in summer 1999, for those who wish to know more.

The performance will also be interspersed by performances by David Stevens
who uses home made sound sources and samples, processes, circulates and
otherwise leavens those sounds.

The event is the final climax of the Planet Tree Music Festival 2000 (the
4th so far) which I direct in London.
www.planettree.org

If there are any tuning folk attending any of the events do come and say
hello.

many good wishes to all,

Lawrence Ball