"To me, the voice is an instrument, just like any other instrument," Regina Spektor says. Shervin Lainez hide caption

itoggle caption Shervin Lainez

The Avett Brothers are real-life siblings Scott (left) and Seth Avett (right), and bass player Bob Crawford. The band's newest album is The Carpenter. Courtesy of the artist hide caption

itoggle caption Courtesy of the artist

"There was this sensation of going on a journey together, without seat belts," says Rhiannon of her band's first totally improvised performance. Her newest album is called Spontaneous. Courtesy of the artist hide caption

itoggle caption Courtesy of the artist