Дюшек Гайда / MattresspipeA double airbed is transformed into a collaborative music instrument, based on the traditional Bulgarian bagpipe Kaba Gaida. Spectators are invited to inflate it and to interact with it. When enough air pressure has been built up in it, a solo flute (chanter) and a drone pipe connected to it produce sounds just like those of the traditional Kaba Gaida. The sound is influenced and controlled by the spectator-participants, who thus play a role in its creation. They can manually inflate the air mattress, lie or roll around on it or otherwise push the air out of it. By performing these actions they cause the chanter to produce music.