One of the mysteries of the English language finally explained.
Mid 19th century. From post-classical Latin diabolus in musica the devil in music, more fully mi contra fa, est diabolus in musica ‘mi’ against ‘fa’ is the devil in music, after German Mi contra Fa ist der Teuffel in der Musica; so called as the interval was regarded as unstable and rejected as a consonance by most theorists.
diabolus in musica/dɪˌabəlʊs ɪn ˈmuːziːkə//dʌɪˌabələs ɪn ˈm(j)uːzɪkə/
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