I sang on this CD. The NPR piece linked here appears to be based on a segment we did a few years later for Pop-Up Magazine in Oakland. An interesting technological tidbit that they didn't mention is the use of contact mics for recreating the Hagia Sophia acoustic in live performances (and the CD recording). The Stanford crew would tape these tiny mics to the middle of our foreheads (with wires running down to portable wireless transmitters on the belt) to get a good mixable channel for each singer, which would go through their signal processing gear to produce an acoustic backing mixed with the live singing. This is totally unusual for performances of this repertory; you normally do concerts entirely "acoustic" with no mics or monitors, and good recordings typically involve either a single pair of crossed mics in front of the whole ensemble or a few strategically placed mics in the space, but no per-singer channels and pop-style mixing tech.