I was in theatre school for a while. We touched on everything related to a theatre production, including sound. Our tech would always test his setup with Paul Simon's Getting Ready For Christmas Day.
I've heard that song used to calibrate audio setups so often that it's become easy to identify any issues when I hear it.
I found this source with some info. Quoting a relevant bit:
It can seem counter-intuitive that riding where the cars are is safer, but if you think about it, it makes sense. Cars don't expect fast-moving vehicles on the sidewalk (they often barely expect pedestrians...), the constant curbs impacts your flow while riding, people more often ride against traffic on the sidewalk than on the road, and honestly people riding on sidewalks probably tend towards more inexperienced than people who feel comfortable riding on the road.