Some bands stick to similar sets from night to night, and others are known for being deeply improvisational. Pearl Jam has a reputation for having a wide range of songs to choose from, yet they seem to really like ending their concerts with a song called Yellow Ledbetter.

It’s a good song, but it’s transformed away from being a song and instead into a signal to the crowd. “Hey,” it says. “This is definitely the last one. You might as well head out to your car to try and beat the traffic.” So I ran the numbers to see how true this really is.