For 10 points, name this home country of Gustav Holst and Edward Elgar.
One composer from this country had his Viola Concerto premiered by Paul Hindemith, and a Russian named Valery Gergiev is the conductor of an orchestra based in this country. A forty-part motet whose title means "Hope in any other" was composed by a man from this country, and Estonian composer Arvo Part wrote a Cantus in Memoriam for another. One person from this country composed a seven-movement suite that includes a piece about the "Bringer of War" that is in 5/4 time, and another composed a collection of five marches, the first of which is often heard at graduations. For 10 points, name this home country of Gustav Holst and Edward Elgar.
One composer from this country had his Viola Concerto premiered by Paul Hindemith, and a Russian named Valery Gergiev is the conductor of an orchestra based in this country.
England [or (Great) Britain; or the United Kingdom]