Song structure or the
musical forms of songs in
traditional music and
popular music are typically
sectional, repeating forms used in
songs, such as
strophic form and is a part of the
songwriting process. Other common
forms include
thirty-two-bar form,
verse-chorus form, and the
twelve bar blues (the latter is used in
blues and
blues rock. Popular music songs are rarely composed using different music for each stanza of the lyrics (songs composed in this fashion are said to be "
through-composed", an approach used in
classical music). Pop and traditional forms can be used even with songs that have structural differences in melodies. A common format is intro, verse, pre-chorus, chorus, verse, pre-chorus, chorus, bridge ("middle eight"), verse, chorus and outro.