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.
Billy Gladstone
Among his inventions is a rare jazz instrument similar to the Bock-a-da-bock, a hand-held cymbal apparatus called the “Ludwig Gladstone Cymbal” when it was introduced by the Ludwig Drum Company in 1927. In 1929 the Leedy Drum Company listed it in their catalogue as the “Hand Sock Cymbals.” Gladstone was granted a patent September 27, 1927, for his "Operating Device for Cymbals," his first commercially accepted patent (his previous patents were not mass-produced). This launched an illustrious career as an inventor of percussion and non-percussion items. On April 21, 1931 Gladstone was awarded a patent for a percussion musical instrument. The patent number is 1,801,422.