From his living room, Yo-Yo Ma launched #SongsofComfort with a short melody by Dvořák. The beloved American cellist, whose Six Evolutions—Bach Cello Suites is out on Sony, invited others to take part, and what began as a lowly melody—albeit played by a peerless artist—is now a social-media phenomenon endorsed by Michelle Obama. In this isolating and fearful time, Ma sees powerful possibilities. “This pandemic,” he recently told The Times of London, “is bringing the whole planet together. For once it’s like every one of our single actions actually has a large effect on the social good.” —J.V.