Conductor Lawrence Renes takes the podium for an evening of all American composers — John Adams, Aaron Copland and our Artist in Focus Steven Mackey. Seattle Symphony Principal Trumpet David Gordon and English Horn Stefan Farkas take star turns in Aaron Copland’s Quiet City, a gentle reflection of urban melancholy and uncertainty. Next, world-renowned saxophonist Timothy McAllister performs a concerto written especially for him by Grammy-winning composer Steven Mackey, who stretches the bounds of classical music by incorporating rock and blues elements, including electric instrumentation. Finally, John Adams’ moving Harmonielehre melds disparate trends of 20th-century music, from minimalist themes in frenzied rhythms to provocative eruptions of dissonance to dazzlingly cinematic soundscapes.