Continuous pitches held while other musical lines interweave are called

In 1907, the retrospective on the work of 19th century post-impressionist georges seurat influenced the development of cubism in a radical way through his painting titled, “sunday afternoon on the island of la grande jatte.” ? ?

What are possible sources a hair designer might use for inspirations

In a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.