A major presentation of Dahlstedt's music and research, as a lecture-recital, a part of the major concert of Tällberg Forum 2013. The performance consisted of the works Circle Keys, Foldings performed by Palle Dahlstedt) and Choir-Quarrel (with Voces Nordicae), and in a related workshop at the same conference, Particle Systems Prototype. Particle System Prototype: preparatory work for a larger installation, presented during the TW@CERN workshop at Tällberg Forum 2013. The idea behind the musical work is to develop a virtual particle system, inspired and influenced by elementary particle physics, to understand and communicate some properties of such a system in a form perceivable by the listeners. Choir-Quarrel: An interactive live electronics piece for 8 singers and 8 speakers, where each singer has a dialogue, or quarrel, with a speaker. The machine analyzes the sung phrase, and sings back through the speaker. Circle Keys: An interactive piece for keyboard performer and live electronics, emulating four virtual musicians controlled by the playing of the human performer – who at the same time interacts musically with them.