With Solo Piano, Glass presents himself "unplugged" - no electronic keyboards or synthesizers, and no overdubs, either - just solo piano. "Metamorphosis" was written in 1988 and takes its name from a play based on Kafka's short story. Its second track, "Metamorphosis Two", formed the basis of one of the main musical themes in the film "The Hours". It is also the song that the American rock band Pearl Jam uses as their introduction music to concerts.