One of my best friends since college has been visiting me. He was a double-degree Music Composition and Philosophy major and is currently learning to play the cello. For the past few days, we've been talking a lot about Bach. I brought him with me to x2 last night, filling in the details of Mark's past work, including the first version of 2 at NW New Works a few years back and, fittingly, The Goldberg Variations. Not surprisingly, after the performance, our conversation turned to repetition and variation.