A cellist plays Janis Kounellis' Untitled (1971) as part of UBS Openings: The Long Weekend 2009.22.05.2009 In Untitled, Jannis Kounellis painted an extract from the score of Bach’s St John Passion on a dark green canvas and had a cellist playing music from the oratorio in front of it for its first exhibition. Cellist Neil Heyde re-created the original performance in the Energy and Process rooms at Tate Modern in May 2009. Jannis Kounellis (born in Piraeus in Greece, lives and works in Rome since 1956) was a seminal contributor to the internationally influential Arte Povera group. Often epic in scale, Kounellis's work emphasises the fragmentary relationship history has with the present.