カバー曲[kabaakyoku] remake of another artist's song (a "cover")
サイン曲線[sainkyokusen] sinusoid
愛唱曲[aishoukyoku] favourite song
委曲[ikyoku] details
一曲[ikkyoku] tune (melody, piece of music)

迂曲[ukyoku] meander
円曲[enkyoku] roundabout way (of speaking or working)
円錐曲線[ensuikyokusen] conic curve
円舞曲[enbukyoku] waltz (composition)
演曲[enkyoku] musical program

御終い[oshimai] the end
テキスト終結[tekisutoshuuketsu] end of text
為し終える[nashioeru] to accomplish
為し終わる[nashiowaru] to finish
異常終了[ijoushuuryou] abnormal termination (e.g. of a program)

一部始終[ichibushijuu] full particulars
引用終わり[inyouowari] end of quote
最終[saishuu] last
最終回[saishuukai] last time
最終段階[saishuudankai] final stage