Lars Gotrich

This might very well be the ultimate lullaby. Right at the start of the 2018 SXSW Music Festival, Max Richter's eight-hour composition Sleep was performed overnight to an audience tucked into 150 beds. They — the audience, not the tireless group of musicians who performed the piece — slept, dreamed and sometimes snored through this trance-inducing experience.

Note: NPR's First Listen audio comes down after the album is released. However, you can still listen with the Spotify or Apple Music playlist at the bottom of the page.

Terry Riley's In C might be considered one of the seminal pieces of minimalism, but at its heart it's an open invitation. The score resides on a single sheet of paper with 53 phrases to be repeated by an indefinite number of musicians.

There is metal between those strings. In a video for "Limonium," Brooklyn-based composer Kelly Moran interrupts the stretched piano wire with corkscrews, forking the paths of sound.