It is hook upon hook upon hook. There is no element to this song that is not super-catchy," said Jepsen's manager, Jonathan Simkin. "The melody is catchy. Those synth string lines are crazy catchy. There is not a single aspect of this song that does not draw the listener in."
The 3 minute and 13 second song, co-written by Jepsen and her guitarist Tavish Crowe and Marianas Trench lead Josh Ramsay, has many elements that composers know make a pop hit and musicologists have identified as signatures of sing-along hits.