Arvo Pärt’s “Fratres” performed by Anne Akiko Meyers.

Make sure you listen to the very end.

On both the title track, it’s nothing, but still, and on the last song the way to heaven, I use a similar technique on my cello—lightly touching the string while bowing—to create harmonics. Playing in this way can create both haunting tones and soaring melodies.

Here’s one of my cello harmonics experiments, played over a processed electric guitar loop.