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

悪筆[akuhitsu] poor handwriting
一筆書き[hitofudegaki] one-stroke sketch
運筆[unpitsu] brush strokes
鉛筆[enpitsu] pencil
鉛筆削り[enpitsukezuri] pencil sharpener

加筆[kahitsu] correction
画筆[gahitsu] artist's brush
偽筆[gihitsu] forged handwriting
曲筆[kyokuhitsu] misrepresentation
健筆[kenpitsu] powerful pen