“100 Bad Days” is the first single from AJR’s third album Neotheater. Band member Jack Met mentioned in an interview that the track touched on their most frequently used mantra, “this is going to be a good story.”

The trio told Billboard:

As a band, and as guys in their twenties, most of our experiences end in rejection, failure, and bad days. We wanted to write a realistic look at that… what doesn’t kill you doesn’t always make you stronger. But what doesn’t kill you always makes you more interesting.”