John Luther Adam's 'Sila' finds its breath at Meridian Hill Park

John Luther Adams has been called a "green" composer, and never was that truer than on Wednesday night at Meridian Hill Park.Over the plashing sound of the terraced waterfalls, framed by thickets of yellow irises, came the lowering rumble of timpani. Cutting through the hum of voices and street traffic and bird song was the gleam of brass instruments: the bright flare of a trumpet and the curl of a trombone, unfolding at first single notes, then fragments, then shining arpeggios that rose and gi...