Type of Song Form:
AAA, also known as the one-part song form, This song form is often used in country and folk music.
Consists of several verses, doesn't have a chorus or bridge, it does however have a refrain in which a line (or the title) is repeated at the end of every verse.
A song that uses the AAA form is "Bridge Over Troubled Water" by Simon and Garfunkel. When you look closely at the lyrics you'll notice that it has three verses each consisting of several lines. Each verse is lyrically different and there is melodic variation in the final verse. At the end of each verse the line "Like a bridge over troubled water" is repeated. You will also notice there is no bridge or chorus.
First A: When you're weary, feeling small
Second A: When you're down and out
Third A: Sail on silvergirl (gives melodic variation)
More information on the different song forms and everything you need to know about lyric writing in Sheila Davis' book Successful Lyric Writing
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