I'll never fully understand the impact that song made on popular music and culture, because I wasn't there to witness it.
Aha. It was late 1966 when I arrived home after a day's work, made my way upstairs, turned on the radio and turned off the light to hear the first UK airing of "Good Vibrations". No obtrusive videos to influence what you saw in your mind's eye, just the music...
I've never understood the connection between "Good Vibrations' and summer. This was October and it had been dark for a few hours already. This was around eight in the evening. I can't even remember which station played it. A comment by AGD makes me suspect that it was Radio London, one of the handful of "pirate" stations active in those years. But I do remember the dark glowing colours I imagined while I was listening, spellbound.
Anyway, gotta find my own rabbit hole now.