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

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.

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

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

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)

Several crises are set to define the next century -- but journalist Aaron Bastani believes we have the technological ability to meet our biggest challenges and create unprecedented levels of prosperity for all. He shows how we could get there by ditching capitalism as the world's economic operating system and adopting "universal basic services," where governments would freely provide life essentials like housing, health care, education and transport. (Followed by Q&A with head of TED Chris Anderson and public finance expert Maja Bosnic)

With infectious energy, singer-songwriter Angélique Kidjo ties together the threads of her legendary career as a creative force and global activist. In conversation with journalist Femi Oke, she discusses how joy powers her music (and sings an incredible impromptu song), details her work spreading educational opportunities to women and girls across Africa and shares her belief that everybody has the power to tap into their potential.

What if you could create new music using your favorite musician's voice? Sharing her melodic gifts with the world, multidisciplinary artist Holly Herndon introduces Holly+, an AI-powered instrument that lets people sing with her own voice. Musician Pher joins her onstage to demonstrate this mind-blowing tech while singing into two microphones -- one that amplifies his natural voice and another that makes him sound just like Holly.

Music can amplify social issues and inspire people to care about new (and sometimes unexpected) topics. But can it take something as dire as climate change and make it mainstream? With artists MyVerse and Kristen Warren as an inspiring opening act, social entrepreneur Samir Ibrahim suggests hip-hop and its stars can help us move from talking about the problem to rapping about (and acting on) solutions.

What does it take to build a legacy? Hip-hop artist Cordae tells how he went from mixtape-dropping high school kid to Grammy-nominated music star whose "Hi Level" mindset helps him achieve his dreams.

How does music shape us? Digital ethnomusicologist and TED Fellow Kyra Gaunt studies how Black girls can preserve the integrity of their own voices while listening, dancing and singing to pop songs largely engineered by men, often with lyrics that express anti-Black, patriarchal sentiments. In a quick, incisive talk, she shows how Black girls can disrupt the stereotypes and stigmas buried within this music and chart their own revolution in sound.

"Music can unlock a frozen memory that melts into the seeds of our creativity," says musician Rosanne Cash. Reflecting on the power of memory, solitude and community, she performs "The Sunken Lands" and "Particle And Wave" and meditates on some of life's most poignant and bittersweet themes.

Performing two original songs, stand-up comedian, writer and musician Marcia Belsky shares comical commentary on some peculiar aspects of our culture -- from Instagram-stalking your crush to fending off mansplainers on social media -- and lampoons NASA's notorious decision to provide astronaut Sally Ride with an egregious supply of tampons for her six-day trip to space in 1983.

Evoke a familiar tune in a song and get slapped with a lawsuit ... it's a tale almost as old as copyright itself. Lawyer and technologist Damien Riehl digs into why "owning" a melody is a ludicrous legal assertion and composes a radical solution for the musical woes of songwriters everywhere.

Have you ever wondered why you like sad music? Do you find comfort or inspiration in rainy days? In this profound, poetic talk, author Susan Cain invites you to embrace the feeling of longing -- or the place where joy and sorrow meet – as a gateway to creativity, connection and love. Accompanied by the splendid sounds of violinist Min Kym, Cain meditates on how heartache unexpectedly brings us closer to the sublime beauty of life.

Singer-songwriter Charlie Puth dazzles in a performance of his effortlessly catchy hit "Attention" and an impeccable cover of Stevie Wonder's "You and I", live from the TED Countdown stage.

Over the last two years, a collective of composers, musicians, computer programmers, scientists and activists has set out to reinterpret Vivaldi's "The Four Seasons" for a transformed world, restituting Vivaldi's score in expected climate scenarios for the year 2050. The project, titled "The [Uncertain] Four Seasons," launches November 5, 2021, which will be Youth Day at the UN climate conference COP26, with fifteen orchestras from around the world performing a localized variation during a global live-streaming event.

"Every conversation has the potential to open up and reveal all the layers and layers within it, all those rooms within rooms," says podcaster and musician Hrishikesh Hirway. In this profoundly moving talk, he offers a guide to deep conversations and explores what you learn when you stop to listen closely. Stay tuned to the end to hear a performance of his original song "Between There and Here (feat. Yo-Yo Ma)."

Twerking is mainstream now ... but do you know where it came from? Superstar Lizzo traces booty shaking to a traditional West African dance and tells how Black women across generations kept the rhythm alive, from blues and jazz singers to modern rap and hip-hop performers. With her characteristic energy, she shares how twerking empowered her to love her own body -- and explains why understanding its origins helps protect Black culture from erasure and misappropriation. (And, yes, she twerks on stage.)

Music can act as a guide, says cellist Steven Sharp Nelson. It has the power to unlock the mind, tap into the heart and bring light in the darkest times. Take a deep breath as Nelson takes you on a melodic, meditative journey that could reconnect you with your closest loved ones -- no matter how near or far they may be.