Dreamed I found a corner where the whole street played along

I'm setting up on a corner I've never seen before, and instead of cars there are these huge brass bells rolling past, each one ringing a chord that matches what I'm playing. I keep changing key just to hear the street follow me. Woke up grinning and tried to hum it on the way to the tube — couldn't get a single note right. Maybe that's what the dream was for, keeping the good version out of reach so I keep practising.