曲
キョク, ま.がる, ま.げる, くま, まがた
bend, music, melody, composition, pleasure, injustice, fault, curve, crooked, perverse, lean
JLPT3 G3 S6 F810
A depiction of a curved ruler or measuring implement → *bend*; *curve* → *tilt*; *turn*; *crooked*; *distorted* → *melody* (← tune which alternates high and low notes).
[Full Kanji Etymology List]