Musical ear syndrome

I thought our neighbours had taken up playing extremely faint indie pop/rock. I could hear it in the kitchen, but only when our new hob extractor fan was on. 

Apparently this is "audio pareidolia": my brain finding patterns in the fan noise. No one is playing music next door. 

I can't identify the songs: they are just too faint and fleeting. It's just a curiosity and I quite look forward to it.