Hanson

Christina Ascani / NPR

We've been recording Tiny Desk concerts for nearly a decade, and in that time, a few artists have come back for encores — folks like Wilco, Chris Thile and the inspiration for the series, Laura Gibson. One band, The Oh Hellos, came back after a year to favor us with a holiday set. But we've never, until now, asked anyone to return later the same day.

Jennifer Kerrigan/NPR

The audience for Hanson's first Tiny Desk concert could be cleanly sorted into two distinct camps: the curious and the committed.

The first time cardiologist Sonia Tolani performed CPR outside a hospital was in 2009.

She was on the subway in New York City, headed home from work, when she saw a man slump to the ground and stop breathing.

"It was super crowded, it was like rush hour," she remembers. "I just decided we needed to do something, and dragged him out into the center of the subway train [and] I just started doing CPR."