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a musical structure that typically consists of 2 musical parts (A and B) played in four sections. Each section is generally eight measures long, resulting in 32-measure form. The A part is played and repeated (8 + 8 measures), followed by the B part or bridge (8 measures), and a return of the A part (8 measures) for an overall form of AABA in 32 measures. In some rock songs the AABA form is borrowed with a great deal of freedom and combined with strophic song form: in some cases the A part further divides into a verse (a) and chorus (b), while the B part retains its bridge function.