譚歌 is read as たんか (tanka) and means ballad.
たんか
tanka
しか
Japanese and Chinese poetry
うた
classical Japanese poem (esp. tanka)
しょうが
music class (at pre-WWII schools)
わか
waka
こいか
love song
こもりうた
lullaby
りゅうこうか
popular song
さんか
song of praise
えんか
troubadour
こっか
national anthem
こうか
school song