カップリング曲きょく

noun

coupling track; B-side

Refers to the additional song(s) included with a single release, alongside the main A-side track. Common in J-pop and music industry contexts.

• このシングルのカップリング曲きょくもとてもいい曲きょくだ。

  The coupling track on this single is also a really good song.

• カップリング曲きょくが意い外がいと人にん気きで、後のちにアルバムにも収しゅう録ろくされた。

  The B-side was unexpectedly popular and was later included on the album as well.