[youtube=http://www.youtube.com/watch?v=LrMBIH2TBpU]   There’s a story up on the Wall Street Journal about the recent(ish) trend in classical concert percussion pieces, including Philip Glass’ Concerto Fantasy for Two Timpanists and Tan Dun’s Concerto for Water Percussion. It mostly covers the growing corps of soloists and the number of new music composers that are growing the repertoire,…