譚詩 is read as たんし (tanshi) and means ballade.
たんし
tanshi
たんしきょく
ballade
うた
classical Japanese poem (esp. tanka)
じょじし
descriptive poetry
かんし
Chinese poem
きんだいし
modern poetry
ふうぶつし
poem about natural scenery or a particular season
し
さくし
versification
さんぶんし
prose poem
verselet
こうきょうし
symphonic poem
やくし
translated poem