Understanding song form is a lot easier than you might think, especially from the perspective of rhythm tracks.  It simply is the sectional structure of the tune – that is, how many sections there are and how long each is.  Some song forms are so popular that they have been given their own name, such as “32-bar AABA” or “16-bar Tune”.  Here’s how you can figure it out for a tune – counting !  Count the number of sections and the number of bars in each section.  In sheet music, bars are separated by a vertical bar ( | ) and sections are separated by a double vertical bar ( || ) – Check out https://alive-drumming.org/hrf_faq/can-i-learn-songform/ 

How can I learn about song form?