In the roughly one hundred years since Arnold Schoenberg began composing "with twelve tones related only to one another," a large number of composers have adopted and adapted his approach in astonishingly varied ways. Composers from every time period and every continent have contributed to this vast and proliferating enterprise. In Twelve-Tone and Serial Composition: The First Hundred Years, we are creating and gathering brief pedagogically-oriented analytical videos. Each video will focus on one short musical passage, showing how the music was made and how it might be pleasurably heard and understood. We offer these videos as a celebratory bouquet, marking the first hundred years of twelve-tone and serial composition.