xtet uses mobile phone handsets to create an ephemeral multichannel sound system, which only exists for as long as the event itself:
By broadcasting real-time audio to the audience's wireless mobile devices (smartphones, tablets, mp3 players, etc), the audience itself becomes a temporary speaker system comprised of countless distributed sound sources, forming a uniquely spatial and participatory experience. The movements of listeners cause the music's spatial formation to shift and grow, akin to the reactive motions of a shoal of fish.
It is both a platform (as a method for streaming multiple unique audio streams over HTTP, with HTML5 display) and a series of works; we are composing a number of pieces of music for xtet as a medium, considering the unusual set of constraints that it imposes. These include not knowing ahead of time how many speakers will be present, and writing for highly treble-weighted playback.
xtet I (α, β, γ, δ, θ, μ) is the first in the series, commissioned by the Barbican and Wellcome Trust for Wonder: Art and Science on the Brain. It is modelled on the patterns and characteristics of neural activity, taking the relative lengths of key types of neural oscillation (alpha waves, beta waves, delta waves...) and using them to determine the structure and timings of musical events.
It's a much looser, higher-level interpretation of cognitive patterns than something as rigorous as the neural nets of The Fragmented Orchestra, but basing the piece on the emergent properties of thought seems like an apt way to start writing for an installation which is itself wholly dependent on collective activity.
We're also excited to be incorporating xtet into the Marcus du Sautoy performance lecture on consciousness, using it to diffuse James Holden's trance-inducing musical material across the audience.
We prototyped it for the first time yesterday, with much assistance from a generous throng of Barbican volunteers, and it was quite magical to hear James's analogue sounds splinter and shimmer across the auditorium.
More information: xtet