The opening piece at Spark, Concert 5 on Thursday, February 19, 2009 was Metamorphoses by Clifton Callendar for three cellos, or solo cello and digital delay. As it happens, it was expertly performed in the latter configuration by Evan Jones. The level and timing of the delay made the piece often sound as though there was more than one instrument present, and auto-panning on the delay trails sent the ghost instruments back and forth across the stage. The cellist was wearing headphones, perhaps listening to a click track. Here’s a short segment from the performance.