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‘Casual music’ for piano & cello (2011)

The piece belongs to the genre of mobiles; each individual part provides a number of sequences, to be executed in any sucession, and repeated any number of times; durations are flexible, tempo is free, parts are not synchronized. The piano-part is noted in conventional notation, the cello-part is noted in a self developed intervall-notation: within the individual sequence intervals are determinate, while the reference-note is always free. The material is shaped out of motion; the performers carry out simple manual activities, whereby the actual sounds appear as side-products of a production process.