John Legend is on a mission to transform America's criminal justice system. Through his Free America campaign, he's encouraging rehabilitation and healing in our prisons, jails and detention centers -- and giving hope to those who want to create a better life after serving their time. With a spoken-word prelude from James Cavitt, an inmate at San Quentin State Prison, Legend treats us to his version of Bob Marley's "Redemption Song." "Won't you help to sing these songs of freedom?"

"Redemption Song" | John Legend

Some of the world's greatest musicians and researchers showcase the power and science of music onstage at the TED conference, TEDx events and partner events around the world. You can also download these and many other videos free on TED.com, with an interactive English transcript and subtitles in up to 80 languages. TED is a nonprofit devoted to Ideas Worth Spreading.

Music

A self-described "dance floor demon," singer-songwriter Tolliver rocks the house with a performance of "Say What!" and "Nervous."

"Say What!" / "Nervous" |  Tolliver

Some works of art stand the test of time; others don't age as well. Using American musical theater as her case study, theater historian Margaret Hall shares a framework of five categories to talk about how art does (and doesn't) remain useful across generations -- encouraging us to address the "growing pains" that all art faces as time and culture moves on.

How modern audiences can talk about aging art | Margaret Hall

Remixing vocals, scat singing and playing the flute and piano, musician Melanie Charles stuns with a performance of two songs.

"Damballa Wedo" / "The Dilemma" | Melanie Charles

Singer-songwriter KERA performs the powerful, entrancing song "Bright Future Ahead," leaving us with a profound message: "Breathe, and go again."

"Bright Future Ahead" |  KERA

By mastering the Eskista, an ancient Ethiopian dance, TED Fellow Melaku Belay survived a childhood on the streets and became a voice for his country. He shares how traditional dances can connect the wisdom of the past to the energy of the future -- and, after the talk, delivers a thrilling performance of Eskista accompanied by a free-jazz ensemble. (In Amharic with consecutive English translation by filmmaker Mehret Mandefro)

"Redemption Song" | John Legend

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