Guido of Arezzo
In the 12th century, a development in teaching and learning music in a more efficient manner had arisen. Guido of Arezzo's alleged development of the Guidonian hand, more than a hundred years after his death, allowed for musicians to label a specific joint or fingertip with the gamut (also referred to as the hexachord in the modern era). Using specific joints of the hand and fingertips transformed the way one would learn and memorize solmization syllables. Not only did the Guidonian hand become a standard use in preparing music in the 12th century, its popularity grew more widespread well into the 17th and 18th century. The knowledge and use of the Guidonian hand would allow a musician to simply transpose, identify intervals, and aid in use of notation and the creation of new music. Musicians were able to sing and memorize longer sections of music and counterpoint during performances and the amount of time spent diminished dramatically.
Guido von List
According to the historian Nicholas Goodrick-Clarke, 1902 marked "a fundamental change in the character of [List's] ideas: occult ideas now entered his fantasy of the ancient Germanic faith." This began when he received an operation to remove a cataract from his eye, after which he was left blind for eleven months. During this period of rest and recuperation, he contemplated questions surrounding the origins of the German language and the use of runes. He subsequently produced a manuscript detailing what he deemed to be a proto-language of the Aryan race, in which he claimed that occult insight had enabled him to interpret the letters and sounds of both runes and emblems and glyphs found on ancient inscriptions. Terming it "a monumental pseudo-science", Goodrick-Clarke also noted that it constituted "the masterpiece of his occult-nationalist researches". List sent a copy to the Imperial Academy of Sciences in Vienna, but they declined to publish it. In 1903 List published an article in "Die Gnosis" magazine, which reflected a clear influence from the ideas of the Theosophical Society.