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You are purchasing high quality sheet music PDF files suitable for printing or viewing on digital devices.Spectrum was originally written in 1975 and revised in 2013. It was written for Derek Foster who played it on a number of occasions.
The work lasts around 4.5 minutes, although the precise duration cannot be specified as there is a degree of freedom in the presentation of the material. It opens with a rising chromatic figure that is used throughout the piece, followed by three notes which are at first stated, then developed freely. A short faster section follows and consists of tremolos and trills together with a very rapid figure. The central section develops trills, tremolos and rising chromatic phrases. This is followed by a reprise of the rapid section, then the first section, forming an arch-like structure (A-B-C-B-A).
The title derives from the use of a variety of techniques and contrasting material on a single instrument. The composer sees this as analogous to the electromagnetic spectrum in physics where one single type of waveform can manifest in a number of totally different ways, such as radio waves, light waves, X-rays, etc.
