Conversation so far:
What is organic music for Tan Dun?
Many of Tan Dun's works call for instruments made of materials such as paper, stone, or water, but compositions that he classifies as organic music feature these instruments most prominently.
Did Tan Dun write any organic music
The first major work for organic instruments was his Water Concerto for Water Percussion and Orchestra.
Any other notable organic music works of Tan Dun besides the Water Concerto for Water Percussion and Orchestra?
The techniques devised in the Water Concerto were used again in Tan Dun's Water Passion After St. Matthew.
Did Tan Dun work with any one else to write the organic music pieces besides Tan Dun?
Tan Dun's next major organic work, Paper Concerto for Paper Percussion and Orchestra (2003) was commissioned by the Los Angeles Philharmonic for the opening of the Walt Disney Concert Hall.
Are there any other interesting aspects about the Tan Dun article?
Earth Concerto for stone and ceramic percussion and orchestra (2009) draws from Gustav Mahler's Das Lied von der Erde (The Song of the Earth), which in turn draws from the poetry of Li Po.

Question: What was his most recent piece?
Self-contained rewrite: What was Tan Dun's most recent organic music piece?