*TIBIA I. *for soprano saxophone and electrroacoustic sounds was composed for a solo instrument and an accompaniment of electroacoustic sounds with the help of the computer program *CCOMP* (Computer COMPosition), which was created also specifically for composition of instrumental and vocal pieces. The basic compositional principle of the program is the use of pseudorandom numbers within defined limits. They are intended to simulate random processes typical of the activity of nature and the human brain. The result is a specific and self-contained compositional style. The electroacoustic sounds were realized in Electroacoustic Studio of Czech Radio in Plzen. In the "Marcel Josse Competition" in Paris (1984) have been awarded with the first prize for this composition and also was performed by *Daniel Kientzy*, an excellent player on soprano saxophone from Paris.
Environs was written as environmental performance piece for outside performance in a large, open, urban square. It deals with our surroundings and the ways in which we perceive ourselves within the environment. In this case surroundings is taken in the broadest sense – physical, spatial, temporal, emotional. The piece focuses on the use of sound to manipulate our perception of the environment and attempts to create a new context in which new relationships lead to new forms of experience. Environs is scored for three Emulator II digital sampling keyboard instruments, soprano saxophone, tenor voice, and visual images. It mixes recognizable and abstract sounds to create a sometimes surrealistic, sometimes serene world of sound and image. Sounds present within the natural environment are welcome to mix into the piece to forge an integration with the real world.