Sound design is built on deception -- when you watch a movie or TV show, nearly all of the sounds you hear are fake. In this audio-rich talk, Tasos Frantzolas explores the role of sound in storytelling and demonstrates just how easily our brains are fooled by what we hear.

Why do we dance? African-American social dances started as a way for enslaved Africans to keep cultural traditions alive and retain a sense of inner freedom. They remain an affirmation of identity and independence. In this electric demonstration, packed with live performances, choreographer, educator and TED Fellow Camille A. Brown explores what happens when communities let loose and express themselves by dancing together.

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?"

Nicole Paris was raised to be a beatboxer -- when she was young, her father, Ed Cage, used to beatbox her to sleep at night. Now the duo is known for their beatbox battles and jam sessions, which mix classic rap beats with electronic dance sounds. Prepare yourself for a bit of a hip-hop history lesson, and enjoy the show.

A genre unto herself, Kaki King fuses the ancient tradition of working with one's hands with digital technology, projection-mapping imagery onto her guitar in her groundbreaking multimedia work "The Neck Is a Bridge to the Body." Using her guitar's neck like a keyboard, she plays an intricate melody as she takes the audience on a musical journey of light and sound. She calls it "guitar as paintbrush."

Artist and TED Fellow Christine Sun Kim was born deaf, and she was taught to believe that sound wasn't a part of her life, that it was a hearing person's thing. Through her art, she discovered similarities between American Sign Language and music, and she realized that sound doesn't have to be known solely through the ears -- it can be felt, seen and experienced as an idea. In this endearing talk, she invites us to open our eyes and ears and participate in the rich treasure of visual language.

Using examples from birdsong, the natural lilt of emphatic language and even a cooking pan lid, singer-songwriter and TED Fellow Meklit Hadero shows how the everyday soundscape, even silence, makes music. "The world is alive with musical expression," she says. "We are already immersed."

For musician Teitur, singing is about giving away a piece of yourself to others. "If your intentions are to impress people or to get the big applause at the end," he says, "then you are taking, not giving." Listen as he plays on stage at TED2015, offering two songs about love, distance and home.

Raised listening to his dad's old records, Joey Alexander plays a brand of sharp, modern piano jazz that you likely wouldn't expect to hear from a pre-teenager. Listen as the 11-year-old delights the TED crowd with his very special performance of a Thelonious Monk classic.

The ten women in this chorus have all been sentenced to life in prison. They share a moving song about their experiences — one that reveals their hopes, regrets and fears. "I'm not an angel," sings one, "but I'm not the devil." Filmed at an independent TEDx event inside Muncy State Prison, it's a rare and poignant look inside the world of people imprisoned with no hope of parole. (Note: The prison's Office of Victim Advocacy has ensured that victims were treated fairly and respectfully around this TEDx event.)