Heidi was scaling rapidly, supporting over 2.7 million patient interactions every week across 110 languages. The sonic identity had to scale with it: one coherent sound to work across product, marketing and clinical environments while distinctive enough to be recognised across every touchpoint as Heidi’s role in care continues to expand.

Beyond the scale, the most vital challenge may have been defining the character of the sound itself. The brief was to humanise an AI platform that lives quietly in the background of one of the most emotionally complex professions in the world. Most AI platforms default to the same language: clean, minimal, impersonal. Heidi's proposition demanded something different. Calm enough to sit inside a consultation without disturbing it. Distinct enough to be remembered. Warm enough to carry the weight of what clinicians and patients bring to every interaction.

We started with a question that had nothing to do with music. What does clinical thinking actually feel like from the inside? Healthcare AI is a crowded landscape and most of it sounds either clinical or aspirational. We wanted Heidi to sound like the clinicians who use it: warm, confident, clear.

An open conversation with a practising clinician was a turning point. It revealed the emotional weight and often unseen demands of the role, and grounded the music in lived experience and empathy. That insight is carried through the harmonic language and the emotional journey held by the strings. From there, two concepts anchored the composition.

The first was Mitosis, drawn from Heidi's visual identity, which carries an idea that runs deep in healthcare: good care multiplies. Just as a cell divides, grows and spreads, from clinician to patient, the sonic identity mirrors that logic and evolves over time. The second was “the conversation”: the three-way exchange between clinician, patient and Heidi that sits at the heart of every interaction. The music was written to reflect that dynamic, with a sense of listening and response built into the vocal textures and the supporting layers beneath them.

The result was an additive approach to composition. Understanding is built in increments through history, signals and patterns. Confidence arises from accumulation rather than a single dramatic reveal. Musical elements enter gradually, layering and recombining in a way that mirrors the rhythm of clinical thinking; never overwhelming the human interaction at the centre.

We delivered a brand anthem, sonic logo and UX/UI sounds, designed to scale across product, marketing and brand touchpoints while amplifying the trust at the heart of the brand, without ever losing the quiet humanity the brief demanded. From the harmonic language to the vocal textures, everything traces back to a specific creative decision rooted in how care should be.

A central decision was to sing the name itself. Heidi sung becomes more than a brand marker, it's a signal of support. A quiet way of saying: we're here. For clinicians, patients and wider audiences, it lands as something heard and held onto, and builds with every listen.

“Clinicians genuinely love Heidi, and that shapes how we think about the brand. The note at the end of the visit, the quality of attention brought back into the room, the evidence behind the decision, the communication that reaches the patient afterward. When people trust you with something so important, every element of the experience matters. That love is what made us want to put the same care into every element of the brand, even the parts that might seem small. MassiveMusic understood that instinctively: that the right sound could carry the same attentiveness Heidi brings to every visit.”

– Hayley Stafford, Head of Brand 

“When MassiveMusic sat down with me, they weren't asking clinical questions, they were asking human ones. The emotional weight of the role, the things you absorb from patients that you never quite forget, is not something clinicians talk about often. That conversation became the brief, and the idea that the music could be grounded in lived experience felt like the right foundation.”

- Dr. Ben Condon (Clinical Director, ANZ)

"The challenge was never to make Heidi sound futuristic, but to reflect the humanity at the centre of the platform. The music needed to feel attentive, additive, and quietly supportive, while carrying the emotional weight tied to the realities of clinical life. Our story, anchored by Mitosis (the division and multiplication of cells) was informed by the brand's visual identity, and governs the way musical ideas grow.. Conversation informed how these musical ideas would listen to one another, and allow space for others to enter, just like the platform. But the more time we spent with the platform and the clinicians using it, the clearer it became that this was not a simple technology story, but an emotional one. The process then became less about branding in the traditional sense, and more about understanding the emotional rhythm of clinical life, allowing the music to feel genuinely connected to the people the platform exists to support."

- Adrian Sergovich (Creative Director, MassiveMusic)

Creative Director: Adrian Sergovich

Music and Sound Creative: Madelyn Tait

Executive Producer: Katrina Aquilia

Head of Brand Strategy and Growth, APAC: Dominic Burnham

Head of Partnerships: Georgia Roberts