Luna Park» is a musical theater piece of about one hour, composed by Georges Aperghis, set design by Daniel Levy, and whose computer music design has been realized by Grégory Beller. The piece, on its use of technology at different levels, uses concatenative synthesis paradigms both in its formal design and deployed processes. Thanks to live computer processes, concatenative synthesis and prosodic transformations of voice are manipuled, and controlled by gesture data incoming from accelerometer sensors made specifically for the piece. The world premier of “Luna Park” took place in Paris, at IRCAM’s Espace de Projection, on June 10th 2011 and during the 2011 edition of Ircam’s Agora Festival. The four performers of this premier were Eva Furrer (on flute, Octabase and voice), Johanne Saunier (voice and danse), Mike Schmidt (base flute and voice), and Richard Dubelsky (air percussion and voice). In “Luna Park”, the percussionist Richard Dubelsky literally speaks with his hand gestures performing Spokhands, a new system developed for the piece.