Two pieces for two organists, with 'primo' being the soloist and 'secundo' maintaining the continuous movement.
The first work, stacks several repeated motifs on top of each other, hence the name CumuliThe opening motif remains almost constantly present, other motifs come and go.
The different lengths create rhythmic shifts. Above this game of repetitions a solo voice stands out with its own development, in a pronounced registration, often jazzy in rhythm and harmony.
A Certain Harmony is based on a chord that forms the calmly moving background as well as the melodic line above it that increasingly breaks away and creates its own world full of movement and dynamics.