Assertion: chord's interval | /r/HasProperty | at the same time
Facets:
value: at much
type: DEGREE
Source sentences:
text: It seems first to have been designated as a "dangerous" interval when Guido of Arezzo developed his system of hexachords and with the introduction of B flat as a diatonic note, at much the same time acquiring its nickname of "Diabolus in Musica" ("the devil in music").