Staid, traditional American symphony orchestras from sea to shining sea have been going all modern with the architectural designs of their new concert halls. So wouldn’t you just know that Nashville, America’s home of country music and gaudy glitz, would spend its $120 million on an old-fashioned neoclassical concert hall for its symphony orchestra. The orchestra hopes to open the hall in 2006, and has raised more than half of the money required to build it.