[2] The concept of a post-chorus has been particularly popularized and analyzed by music theorist Asaf Peres, who is followed in this article.
[2][1] Characterizations of post-chorus vary, but are broadly classed into simply a second chorus[3] (in Peres's terms, a detached postchorus) or an extension of the chorus[4] (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.
Characterization of a post-chorus varies, beyond "comes immediately after the chorus"; Peres characterizes it by two conditions:[2] it maintains or increases sonic energy, otherwise it is a bridge or verse; and contains a melodic hook (vocal or instrumental), otherwise it is a transition.
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".