align="center" | B |What'll I do with just a photograph to tell my troubles to? |- | align="center" | A3 |When I'm alone with only dreams of you that won't come true… What'll I do? |} Terminology Sectional verse Some Tin Pan Alley songs composed as numbers for musicals precede the main tune with what was called a "sectional verse" or "introductory verse" in the terminology of the early 20th century. This introductory section is usually 16 bars long and establishes the background and mood of the number, and is musically undistinguished, with a free musical structure, speech-like rhythms, and rubato delivery, in order to highlight the attractions of the main tune. The sectional verse is often omitted from modern performances. It is not assigned a letter in the "AABA" naming scheme. The introductory verse from "What'll I Do" by Irving Berlin is as follows: Gone is the romance that was so divine,'tis broken and cannot be mendedYou must go your way, and I must go mine,but now that our love dreams have ended... Bridge In music theory, the middle eight or bridge is the B section of a 32-bar form. This section has a significantly different melody from the rest of the song and usually occurs after the second "A" section in the AABA song form. It is also called a middle eight because it happens in the middle of the song and the length is generally eight bars. Terminological confusion In early-20th-century terminology, the main 32-bar AABA section, in its entirety, was called the "refrain" or "chorus". This is in contrast to the modern usage of the term "chorus", which refers to a repeating musical and lyrical section in verse–chorus form. Additionally, "verse," "chorus", and "refrain" all have different meanings in modern musical terminology. See the below chart for clarification: History Though the 32-bar form resembles the ternary form of the operatic da capo aria, it did not become common until the late 1910s. It became "the principal form" of American popular song around 1925–1926, with the AABA form consisting of the chorus or the entirety of many songs in the early 20th century. It was commonly used by composers George Gershwin, Cole Porter, and Jerome Kern, and it dominated American popular music into the 1950s. The 32-bar form was often used in rock in the 1950s and '60s, after which verse–chorus form became more prevalent. Examples include: