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

イ短調[itanchou] A minor
イ長調[ichouchou] A major
カーソル強調[kaasorukyouchou] cursored emphasis
ト短調[totanchou] G minor
ト長調[tochouchou] G major

ニ短調[nitanchou] D minor
ニ長調[nichouchou] D major
ハ短調[hatanchou] C minor
ハ長調[hachouchou] C major
ヘ短調[hetanchou] F minor