AABA is a shorthand notation for a common song form where A is the main theme and B is a bridge theme. AABA means that the main theme A is played twice, foloowed by the bridge, B, before a testatement of the original theme A. Sections are of the same length, often 8 bars each giving 32 bars in total.
Found on http://www.songstuff.com/glossary/A
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