Two little bunnies are walking down the street
Showing happy faces to all the folks they meet.
Mary keeps on laughing: "Oh, aren't they sweet"?
Looking at the bunny slippers on her feet.
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Alliteration is a common figure of speech used in poetry and not only. Basically, it involves starting two or more words in a line with the same letter in order to create a certain 'musical' effect. Nursery rhymes are often ideal to illustrate alliteration poems. Sometimes you don't have to go any further than that to understand the concept and get a feel of it. Here are a few alliteration examples in poems (I marked the repeating letter in different colours for an easier grasp):
Snow is slowly settling down
Cluttered clouds look like a crown.
No one knows the nameless night
When we wandered weak and wild.
Lily loves the little lake
Where the lovely lilies grow
Keith can cook a crumbling cake
Sue sings solo in the snow.
Sometimes the sounds in an alliteration are marked by different letters that are pronounced in the same way (k / c) or even by combinations of letters that are pronounced like a single sound (n / kn).
The repeating letter can also be used in the middle of a word for a more musical effect or when it is difficult to find a word starting with that letter in the context (like in "Lisa listens all along").