Robin Hayward

Microtonal F tuba plus 7-channel sound system

Tetrahedron was written for the tetrahedron-shaped space at the Logos Foundation in Ghent. The form of the tetrahedron is represented within a three-dimensional diagram of harmonic space, based on prime numbers 3, 5 and 7. The resulting harmonic structure is then projected back onto the physical performance space by placing a speaker at each of the three ascending surfaces and four corners of the tetrahedron. Having established an essentially static relationship between harmony and space, the composition focuses on moving through this space over time.