Giacinto Scelsi (1905-1988) was an Italian composer and rather unusual pioneer of electronic music. His works are neither based on traditional techniques nor do they resemble concepts of the 'new music' avant-garde. He recorded improvisations on the ondiola (an early electronic instrument) to magnetic tape, often in multiple layers. These recordings were then transcribed into scores by his assistants – constituting the first attempt at sounding electronic music through acoustic instruments and their players instead of loudspeakers. SFERA is a dialogue between Jeremias Schwarzer's performances of some of Scelsi's most focused and striking pieces for solo instruments and new electronic works by Stefan Goldmann. The two groups of works exhibit polar opposition and unusual metaphorical proximity at the same time. Goldmann's multi-faceted music exhibits shape-shifting capabilities as liquid as Scelsi's pieces for ensembles or orchestra (such as Anahit or Uaxuctum). However, they make full use of the morphing capabilities of contemporary synthesis, constructing multidimensional movements across a vast parametric space. Jeremias Schwarzer adapted most of Scelsi's works in this album for different kinds of recorder for the first time. They form a baseline for Stefan Goldmann's overflowing electronics, which seem to grow out of and fold back into it as if breathing. Thus a conceptual full circle is formed whose two tangents are mirroring each other.