I think Tan Dun’s Ghost Opera is more a performance art than a music piece. The staging is interesting. The sound, produced by stone, water and metal, among other real instruments, is, if not particularly pretty, at least never dull. you can judge for yourself. The Melody for Dialogue Among Civilizations Association will present it on March 22 (on the occasion of World Water Day ) at Merkin Concert Hall. Soloists include Guo Gan on the erhu, and Liu Fang on the pipa.