The Metamorphosen Chamber Orchestra has been developing a college audience, so the demographics of its public must be the envy of many other musical institutions. Founding music director Scott Yoo draws his players from the cream of young musicians on the Eastern seaboard. Some of the current group must have been in kindergarten when Metamorphosen was founded a decade ago. Many in the Jordan Hall audience Saturday night were the same age as the performers, creating a lively dynamic.
Every Metamorphosen program has featured a new work, usually by one of the consortium of young composers affiliated with the group. Saturday night brought a Symphony for Strings by Jeffery Cotton. One movement of this piece, the "Elegy," was written in the aftermath of 9/11 and premiered by Metamorphosen two weeks later. Later, Cotton incorporated it into a three-movement string sextet. Cotton has expanded the sextet by adding another movement to create a symphony lasting pretty close to a half-hour.