Maestros, if you please ... !

Cellist Maya Beiser plays a gorgeous eight-part modern etude with seven copies of herself, and segues into a meditative music/video hybrid -- using tech to create endless possibilities for transformative sound. Music is Steve Reich's "Cello Counterpoint," with video from Bill Morrison, then David Lang's "World to Come," with video by Irit Batsry.

José Antonio Abreu is the charismatic founder of a youth orchestra system that has transformed thousands of kids' lives in Venezuela. He shares his amazing story and unveils a TED Prize wish that could have a big impact in the US and beyond.

The Teresa Carreño Youth Orchestra contains the best high school musicians from Venezuela's life-changing music program, El Sistema. Led here by Gustavo Dudamel, they play Shostakovich's Symphony No. 10, 2nd movement, and Arturo Márquez' Danzón No. 2.

Tod Machover of MIT's Media Lab is devoted to extending musical expression to everyone, from virtuosos to amateurs, and in the most diverse forms, from opera to video games. He and composer Dan Ellsey shed light on what's next.

Conductor Charles Hazlewood talks about the role of trust in musical leadership -- then shows how it works, as he conducts the Scottish Ensemble onstage. He also shares clips from two musical projects: the opera "U-Carmen eKhayelitsha" and the ParaOrchestra.

In this soaring demonstration, deaf percussionist Evelyn Glennie illustrates how listening to music involves much more than simply letting sound waves hit your eardrums.

Ge Wang makes computer music, but it isn't all about coded bleeps and blips. With the Stanford Laptop Orchestra, he creates new instruments out of unexpected materials—like an Ikea bowl—that allow musicians to play music that's both beautiful and expressive.