Sally Beamish is officially “Britain’s most prolific composer of concertos,” a distinction that frequently puts her in the position of composing especially for some of the world’s finest musicians. This fall, Scottish concertgoers will have a chance to hear what all the excitement is about, and then some. “What is about to happen is probably unprecedented in Scotland, outside of a festival context. Within a period of six weeks, five of Beamish’s concertos will be played, including one world premiere and one Scottish premiere.” And it’s not even her 50th birthday or anything! (That comes next summer, along with what will surely be an even larger wave of performances.)