Willem Boogman



12:34 minutes

commissioned by

November Music Festival 2008 & Spectra Ensemble

dedicated to

Conny Aerts


April 13, 2013
Den Haag, Arnold Schoenbergzaal
Ryoko Imai - percussion
Casper Schipper - sound direction

buy the score



(based on the star HD 129929) from Sternenrest
for glass percussion, computer and Wave Field Synthesis (2007)

(see also Sternenrest)


GLAS from Sternenrest, performed by Arnold Marinissen - glass percussion, Casper Schipper - sound direction & the Wave Field Synthesis loudspeakersystem
live recording by Bert van Dijk, January 21, 2012
Orgelpark Amsterdam
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picture of the sound movements during Part II, GLAS from Sternenrest (Wave Field Synthesis' display)

program notes

GLAS (based on the star HD 129929) occupies a central position in the cycle Sternenrest. In this version GLAS is performed as an independent piece. Its music is modeled on the measurement data and results of the research into the star HD 129929, as formulated by Conny Aerts in the scientific magazine Science (2003). The measurement data includes six star frequencies and details about the star’s various rotation layers and rotation speeds. Thanks to the possibilities inherent in the Wave Field Synthesis loudspeaker system, the audience can imagine itself inside the star, from which position the sound waves and sound movements of the star can be followed. This movement deals with the star’s development from her first light until the point that she explodes (supernova). The discovery in 2006 that acoustic sound plays a decisive role in a star’s supernova phase also played a part in the music’s development.
The percussion consists of twenty-two glass instruments: lampshades, bowls, vases, tabletop, etc. sampled and analyzed, they form the basis for electronic music.

For extended notes on GLAS see the preface of the score of Sternenrest

The electronic music was developed at the Institute of Sonology in The Hague with the help of the lecturer/composer Johan van Kreij and the two students Billy Bultheel and Casper Schipper. They designed the software and realized the electronic sounds, which are projected by means of Wave Field Synthesis.
This system, built by the Dutch foundation The Game of Life, consists of 192 loudspeakers and eight subwoofers and was presented in 2006. The system projects sound evenly throughout the listening space, and makes possible an exact positioning, and moving around, of sounds in relation to the listener.

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in preparation: version for 4 (or more) loudspeakers and percussionist