Metropolis Ensemble, a talented freelance orchestra, responded with skill and exuberance to Mr. Tan’s thrusting arms and clutching fingers.

What impressed most was the diversity of approaches that the composers involved took to stretching a more or less conventional chamber ensemble’s sound through electronic legerdemain.

Metropolis was really an umbrella group that brought together instrumental soloists, chamber ensembles, singers and a few composers for a benefit performance for Partners in Health.