music: Category: Terms: A direction to play slower, louder.?

Questions

Which composer wrote the piano work "Microkosmos" to teach children the modern idiom ?

The Concerto for Orchestra was written by : ?

This European composer spent the last years of his life living in appalling poverty in New York City. Near the end, he was commissioned to write a piece for the Boston Symphony Orchestra. His name: ?

To which opus was Robert Schauffler referring when he said; "It is as long as a symphony, as brilliant and as difficult as a concerto. " ?

Chopin and George Sand hoped to have an idyllic holiday on this island paradise. Instead it turned into a nightmare. Name this island. ?