"A unique collaboration between a musician and a painter: Sean O'Hagan/The High Llamas and Jean Pierre Muller. The Musical Painting can be described as a large picture composed of wooden shapes that fit into one another. It produces its own soundtrack but with a distinctive novelty - it is the viewer who, by playing with the moveable parts of the painting, is in fact the conductor of the piece. This unique fusion between vision and sound is the fruit of the collaboration between Sean O'Hagan's '…