Jon Gold’s new single, "Lullaby for a Dream," is an act of gorgeous disorientation. You see the name—a pianist rooted in the intricate soils of jazz—and you prepare for one thing, but what arrives is a mist-laden skiff drifting from an entirely different shore. Gold, a Delaware musician, has composed a piece of British-Gaelic folk, and the cognitive dissonance is half the immediate magic....

What does it mean for music to be “live” anymore? In an era of backing tracks, digital corrections, and performances polished to a frictionless gleam, the term has lost some of its meaning. It often signifies little more than the physical presence of a performer on a stage. But then, an album like Udeigwe’s "Live in Williamsburg" appears, and it serves as a powerful reminder...