I was sick a lot as a little kid and the only thing that would calm me down or make me feel better was music so my mother would play lots of music as I was on my baby blanket in front of the hi-fi. Everything from Segovia guitar, classical music, pop tunes, you name it. I was almost force fed a diet of interesting music between ages 1-4 every day.
Later on when I was a little bit older kid, I would “notice things”. I’d love it when my parents would drive the car over a certain bridge on the way to our grandparents place in southern minnesota because it would make a particular “memorable” sound. This is when I was a little kid, maybe 4-5 years old.
That same sound would be emanated by a small electric fan when set to low speed that was in my room as a kid. Same pitch/texture. Somehow it was comforting because I associated it with the fan being on at night and I could sleep to that sound.
And that same note was played in a two part bass line in a Rolling Stones song “Hang Fire” years later.
I don’t think I have perfect pitch because I never was given musical training until later but I could “summon at will” a photographic “sound memory” of a particular sound. If I listen to a piece of music a lot, I can “remember it”. It’s very weird.
So I don’t think I have perfect pitch because I can’t tell you always what the note is but I can pick up a guitar often and play a piece I hear on the radio because I can “hear what they’re doing”. Common guitar chords have a tone and texture that my brain just knows “They played a Eflat, a Bminor then a D followed by a C”.
But I still say I don’t have perfect pitch because it has to be connected to a piece of music sometimes and chords in relation to others not just going to a piano and playing a middle C. I might get it sometimes but not others. And some really complicated piece with a lot of jazz fusion type chords that I might not get either.
So I think I just have better than average relative pitch maybe.