Harmonic Horizons presents my research regarding the structuring of harmonic material in my music written between 2011 and 2013. The selected work, the oratorio Johannes Uppenbarelse, illustrates how I have established and developed my harmonic language and how this is implemented chordally, melodically and structurally. The goal of this research is the development of my strategy to create a new kind of functional harmony, which utilises notions of relative consonance and dissonance within its own defined boundaries.