You recognized it before you knew you recognized it.
A few notes from the next room. A two-second clip before the video starts. A chime when you tap your card. Something in your brain fires — I know that — and a company's name surfaces without effort.
That's not an accident. That's a brand that's done its homework.
Why sound works differently
The brain processes audio in 8–10 milliseconds — roughly three times faster than visual stimuli.
Which means a sonic logo can capture attention before a viewer even registers a visual logo on screen. Sound reaches the limbic system, the brain's emotion and memory center, before higher cognitive functions even engage. The amygdala and hippocampus process it together: one reads the emotion, the other encodes it into long-term memory.
This is why a few notes of a childhood song can teleport you back decades in an instant.
Research from Oxford found that sound accounts for roughly 41% of how people perceive a brand overall — it doesn't just affect what we hear, but what we see, taste, and feel.
There's also the earworm effect. Hearing only a fragment of a melody creates a cognitive itch, causing the brain to replay it obsessively to complete the sequence. This is why a 3-second sonic logo can occupy mental real estate for hours.
Windows 95 — the sound of a new era
In 1994, Microsoft hired Brian Eno to compose the startup sound for Windows 95.
The brief was almost impossibly contradictory: the piece needed to be "inspiring, universal, optimistic, futuristic, sentimental, and emotional" — and it had to be under four seconds, because that's all the time a computer gave you before the desktop loaded.
Eno's response was to compose 84 different versions. The final piece — six seconds of shimmering ambient sound — was written on a Mac, because he didn't own a PC.
It plays at the start of every session. Before you type anything, before you open any application, before you do any work — you hear it. Repeated exposure across millions of computers turned it into one of the most recognized sounds of the decade.
The piece is deceptively simple. But it accomplished something remarkable: it made booting a computer feel like the beginning of something.
Netflix — designing two seconds
In 2015, Netflix VP Todd Yellin gave sound designer Lon Bender a brief: create a sound that works before every piece of content Netflix produces. Drama, comedy, horror, documentary — it needs to fit all of it.
Bender spent months evaluating concepts. Screaming goat. Ocean bubbles. Music box. About 30 ideas in total, none quite right.
The final "ta-dum" came from an unlikely source: Bender's wedding ring knocking against a wooden cabinet in his bedroom. He layered it with a slowed-down anvil hit for weight, then added a fragment of reversed electric guitar — a recording that sound designer Charlie Campagna had made in the 1990s and never used.
The whole thing is under three seconds. But in user testing, people immediately associated it with words like "movie," "dramatic," "beginning." No Netflix branding needed.
For cinema releases, Hans Zimmer composed a 16-second orchestral version that builds to the same two hits. The same two notes, scaled up to fill a theatre.
They almost went with a goat bleat instead — a nod to MGM's lion roar. Imagine.
The Australian Open — a sound you can chant
Most sonic logos are designed to be heard passively.
The Australian Open set out to create one that an entire stadium could participate in.
In 2021, Tennis Australia commissioned Resonance Sonic Branding to build a sonic identity for the AO from scratch. The brief: capture what makes the AO different from Wimbledon, Roland Garros, and the US Open. The answer they landed on was joy — the AO is known as the Happy Slam, and that energy needed to be audible.
"For a brand like ours, sound is synonymous with the sport. From racquets to the balls hitting the ground, roar of the crowd, live stage music — it's prevalent in everything we do. But we didn't have that ownable asset."
The centrepiece is a brand anthem built around one ingenious detail: an "AO, AO" crowd chant embedded into the composition itself.
Ralph van Dijk: "The 'AO, AO' chant — that's a gift. Not every brand has a name that can be abbreviated like that. It's a simple phrase, you can sing it, and it sounds musical."
The anthem debuted at AO 2022 and now plays at player walkouts, the nightly light show, broadcast packages, and highlight reels. For AO 2026, it was reimagined with 55 musicians from the Melbourne Symphony Orchestra.
The simplest measure of success: van Dijk attends the tournament every year. People hum the anthem as they leave.
Three sounds, three very different briefs. One ambient shimmer designed for solitude. One two-second jolt designed for every genre. One chant designed to fill an arena.
What they share is intentionality — each was built to do a specific thing, in a specific moment, for a specific audience.
Most brands have a logo. Fewer have a sound. But the ones that do own something that a visual identity simply can't replicate: the ability to reach you before you're even paying attention.