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

哀楽[airaku] grief and pleasure
愛楽[aigyou] seeking after (Buddhist teachings, etc.)
安楽[anraku] ease
安楽死[anrakushi] euthanasia
悦楽[etsuraku] enjoyment

音楽[ongaku] music
音楽の素質[ongakunososhitsu] aptitude for music
音楽会[ongakukai] concert
音楽史[ongakushi] music history
音楽大学[ongakudaigaku] College of Music

独りで[hitoride] alone
独り芝居[hitorishibai] one man show
独り舞台[hitoributai] performing solo (by oneself)
独り歩き[hitoriaruki] walking alone
曲独楽[kyokugoma] top

軍部独裁[gunbudokusai] military dictatorship
孤独[kodoku] isolation
国家独占[kokkadokusen] state monopoly
宗教的独立性[shuukyoutekidokuritsusei] religious independence
単独[tandoku] sole