An audience symphony orchestra

Is it possible to bring together sixty musicians who have never played before, to have no sheet music, without rehearsal and without warning, and then to play something spectacular?

Absolutely, yes!

Jacob Collier has spent years building a reputation as one of modern music’s most unpredictable minds. Famous for his dense harmonies, microtonal ideas, and audience participation, he often transforms crowds into choirs during performances.

In San Francisco in October 2025, Collier brought together sixty musicians, many of whom had never played together. There is no better way to describe what he did than to say he ‘constructed music spontaneously’.

What made the performance remarkable was not merely the improvisation itself, but the way Collier communicated musical ideas. He assigned emotional and rhythmic identities to sections of the orchestra almost conversationally. Strings became atmosphere while brass became momentum.

The vocals that he instructed the audience to sing were transformed into texture. With gestures and quick harmonic cues, he guided dozens of musicians and the audience through an unfolding composition that nobody in the room fully know until it all came together.

Watching Collier conduct is fascinating because he treats harmony as a physical object. He doesn’t merely instruct musicians to play notes, he shapes tension and release like a sculptor working clay.

In the San Francisco performance, Collier layered voices and orchestral colours gradually until the entire hall seemed suspended inside one giant chord progression. The audience was not separate from the experience, they became an integral part of it.

While many artists focus on technical perfection, which is important, Collier seems obsessed with participation. His concerts consistently invite audiences into the musical process, turning passive spectators into collaborators. The San Francisco orchestra event represented the most ambitious version of that idea so far. Rather than showcasing virtuosity alone, the performance celebrated trust: trust between conductor and musicians, between musicians and audience, and between structure from chaos.

Part of the emotional impact came from the visible joy onstage. The musicians were clearly listening intensely to one another, reacting moment by moment as the arrangement evolved. That kind of live responsiveness is rare in orchestral settings, where performances are typically rehearsed extensively. Here, uncertainty became the source of excitement. You could sense everyone leaning into the unknown together.

There is something unique about Jacob Collier. His genius does not necessarily lie in inventing completely random music from thin air. Instead, it lies in orchestrating human connection at astonishing speed. He understands how musicians think, how audiences respond, and how harmony can guide people toward a shared experience. He is less interested in showing off his skill than in creating participation and great experiences.

In many ways, the San Francisco performance captured why Jacob Collier has become such a compelling figure in contemporary music. Plenty of musicians are technically gifted. Plenty are experimental. Very few can make complexity feel joyful and inclusive at the same time. Collier’s improvisation with the orchestra demonstrated that music can still surprise people, not through spectacle alone, but through genuine human collaboration unfolding in real time.

Online reactions reflected the emotional intensity. The performance was described as “magical” and “magnificent”. But these words, although powerful, don’t really do justice to the performance; it needed to be watched and enjoyed.

For a few minutes inside that hall, music stopped being a finished product and became a conversation. And that may be Jacob Collier’s most radical idea of all.

By Norman Thomson