“Theme song” in Japanese
Short answer
Theme song in Japanese is “主題歌” (shudaika). Full meaning: theme song.
Other ways to say “Theme song” in Japanese
テーマソング
teemasongu theme song
主題曲
shudaikyoku theme music, theme song
ＯＰ
oopii opening credits, title sequence; theme song (played during the opening credits of a TV show, etc.); overprint
テーマ曲
teemakyoku theme music, theme tune, theme song
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