Philip Glass' 1987 album Songs from the Trilogy is made up of brief selections from his three portrait operas, Einstein on the Beach (1976), Satyagraha (1980), and Akhnaten (1983). It gives a good idea of what the music from the operas sounds like, but at the same time it misrepresents what the music is actually about. In developing his "music with repetitive structures" (the description he preferred over "minimalism"), Glass was creating a new kind of experience, one in which the traditional temporal expectations of a piece of music are overturned, where changes happen incrementally and very slowly over a long (sometimes a very long) span of time.

The recording of the original production of Philip Glass' and Robert Wilson's Einstein on the Beach has iconic significance both in the development of the musical style unfortunately known as minimalism, as well as in the history of music in the late twentieth century. It was a watershed moment when Glass and his ensemble brought the nearly five-hour opera to the Metropolitan Opera House in 1976; his unique aesthetic convictions moved from the rarefied atmosphere of loft concerts into the face of the classical music establishment in a way that could not be ignored.

The origins of Philip Glass' Voices, for didgeridoo and organ was specific: a commission from the city of Melbourne, Australia, in 2001. Yet the instrumental combination works so well that it seems almost foreordained, and Glass went on to write further music for the soloist here, Mark Atkins. In this performance, the didgeridoo and organ tracks were recorded separately, in Australia and upstate New York, respectively, and in Glass' metronomic world this works well enough. Yet one hopes that this release on Glass' Orange Mountain Music label is enough to spur future live performances with both players in the same room. The addition of the didgeridoo to the relatively homogeneous texture of Glass' organ writing is dramatic, but it doesn't disturb the basic shifting fields of the composer's music. It just deepens their color and variety in an immensely attractive way.