The Hierarchy of Song Structure
David Schmoll
 

Verse (exposition)  Chorus (thesis) Bridge (a žtwistÓ or ževidenceÓ that supports the exposition)
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Phrase (individual line or lines within the above Ů a musical sentence; often four per V/C/B)
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Measure (a unit of time that divides the phrase; often two or four measures per phrase or line)
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Beat (a smaller unit of time that divides the measure; often four beats per measure)