 However, stories that singers were excommunicated or otherwise punished by the Church for invoking this interval are likely fanciful.At any rate, avoidance of the interval for musical reasons has a long history, stretching back to the parallel organum of the "Musica Enchiriadis".In all these expressions, including the commonly cited ""mi contra fa est diabolus in musica"", the "mi" and "fa" refer to notes from two adjacent hexachords.