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

印譜[inpu] book of seals
音譜[onpu] music
花譜[kafu] flower album
画譜[gafu] picture book or album
楽譜[gakufu] score (music)

棋譜[kifu] record of a game of go, shogi, chess, etc.
記譜[kifu] writing a musical score
記譜法[kifuhou] musical notation
曲譜[kyokufu] musical composition
系譜[keifu] genealogy