Is "Yin" a form of ancient poetry, or a name for ancient poetry?

Yin: A name for an ancient poetry genre. (A form of ancient poetry) such as lime chant,

In addition, there are also

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Pipa Xing

Dan Ge Xing

Song

Song of Everlasting Sorrow

Song of the Thatched House Broken by the Autumn Wind

Li Ping's Konghou Yin

Music

Plucking Lotus Song

Words

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