Write the next sentence in this paragraph:

How to write a catchy song
Choose your subject matter.
Begin by asking: what do you feel inspired to write a song about? The most popular songs often have emotional content that is relatable and that resonates with the listeners' own experiences.
Write an arresting first line.
The first line is important because it introduces the subject you are writing about and establishes the mood of the song. It can also be an effective way of grabbing listeners' attention from the very first instance.