The first time you see the name tag of a section (e.g. [Chorus]), it comes along with its content—i.e. the lyrics and/or the chords. Any further mention of that section in the page actually refers to that definition.

Take this one-pager for instance:

5 sections are defined:

  1. the [Chorus] section (delimited in red)
  2. the [Bridge] section (in green)
  3. the first Verse section (in purple)
  4. the [Fill] section (in blue)
  5. the second Verse section (in brown)