This is how professionals write songs.
Cheer Up Gary song writing process was last modified: May 9th, 2012 by John Pape
Sometimes the lyrics or storyline are so powerful, or the message so potent, that we associate that subject with a certain song. This association actually hooks the listener into identifying with a certain subject or emotion. This angle is a bit less defined than going with a traditional song structure hook based on repetition, but can also be very powerful. You could almost call this a content hook.