Iron Orchid Ning Yu and David Bird New Focus Recordings   Composer and electronic musician David Bird’s work Iron Orchid enlists pianist Ning Yu as a collaborator. Bird’s electronics often provide steely sounds that accord both with the title and the inside the piano work that Yu does. In fact, the second word of the title plays a role in the piece as well, indicating the organic nature of its formal design. So does the presence of live electronics against an acoustic piano, albeit one that has effects, microtones, and reverb as part of its palette. Thus in sections like