Post-chorus

In music, particularly Western popular music, a post-chorus (or postchorus) is a section that appears after the chorus. The term can be used generically for any section that comes after a chorus, but more often refers to a section that has similar character to the chorus, but is distinguishable in close analysis. The concept of a post-chorus has been particularly popularized and analyzed by music theorist Asaf Peres, who is followed in this article.
Characterization.
Characterizations of post-chorus vary, but are broadly classed into simply a second chorus (in Peres's terms, a "detached postchorus") or an extension of the chorus (in Peres's terms, an "attached postchorus"). Some restrict "post-chorus" to only cases where it is an extension of a chorus (attached postchorus), and do not consider the second part of two-part choruses (detached postchorus) as being a "post"-chorus.
As with distinguishing the pre-chorus from a verse, it can be difficult to distinguish the post-chorus from the chorus. In some cases they appear separately – for example, the post-chorus only appears after the second and third chorus, but not the first – and thus are clearly distinguishable. In other cases they always appear together, and thus a "chorus + post-chorus" can be considered a subdivision of the overall chorus, rather than an independent section.
Characterization of a post-chorus varies, beyond "comes immediately after the chorus"; Peres characterizes it by two conditions: it maintains or increases sonic energy, otherwise it's a bridge or verse; and contains a melodic hook (vocal or instrumental), otherwise it's a transition.
Examples.
Detached post-choruses typically have distinct melody and lyrics from the chorus:
Lyrics of attached post-choruses typically repeat the hook/refrain from the chorus, with little additional content, often using vocables like "ah" or "oh". Examples include:
Hybrids are also common (Peres: "hybrid postchorus"), where the post-chorus keeps the hook from the chorus (like an attached postchorus), but introduces some additional content (hook or melody, like a detached postchorus).