Why I memorise my contacts' music habits

Half a year. That's how long it was between the moment someone told me at an event that he listens to only one album by one band on every business trip — and the moment I ran into him again and asked: 'Hey, which band was it this time?'

His eyes lit up. Really. He beamed and told me he'd been listening to Metallica. And suddenly we weren't two businesspeople who vaguely knew each other from some event. We were two humans with a shared story.

That moment proved something I'd only suspected: it's not the grand gestures that build relationships. It's the small details. The things that don't really matter — except they show you were listening.

British anthropologist Robin Dunbar showed that the human brain can maintain roughly 150 stable relationships at once (Dunbar's Number). With 200+ professional contacts, the biological limit is exceeded — personal details are inevitably lost, unless you use an external system as a memory aid.

I'd noted that Metallica detail in my app. Ten seconds of voice input after the event. And half a year later, it was that one sentence that made the difference between 'Do we know each other?' and 'You remember me!'

It sounds like a small thing. It is. But that's exactly the point: nobody expects you to remember something like that. And when you do, something emerges that no pitch in the world can buy. Trust.

A similar story: years ago, I worked with a sales coach. After the engagement ended, we lost touch. Years passed. Then, as I started working intensively on relationship management, he came back to mind. I simply messaged him and asked if he fancied a call.

His reaction? Immediately open. And what followed was a lively exchange that continues to this day. What it taught me: it's not just important to remember details — it's equally important to remember the people themselves. The ones who mattered once. The ones who might matter again.

Psychologist Naomi Eisenberger (UCLA, 2003) demonstrated that social rejection — including being forgotten — activates the same brain regions as physical pain. Conversely, feeling seen and remembered activates the reward system. From a neurological perspective, remembering someone is a gift.

Harvey Mackay, one of the most influential sales authors in the US, developed the 'Mackay 66' — a list of 66 personal things to know about every key business contact. From favourite restaurant to the kids' university. His argument: whoever knows these details has an unfair advantage over any competitor who only knows the pipeline.

I'm not the type for 66-item lists. But I am the type who spends 30 seconds after a meeting talking into his phone: 'Thomas only listens to one album on business trips. Metallica fan. Watch collector.' That's enough. Nothing more needed.

The hard part isn't caring about people. The hard part is remembering six months later what they told you. Your brain wasn't built for that — but there are better tools.