In terms of a piece being 'political' which doesn't attempt to challenge or overthrow the status quo, the most obvious category for that would be numerous works celebrating those in power, either directly or indirectly: Beethoven's Wellingtons Sieg or Der glorreiche Augenblick, Berlioz's Symphonie funèbre et triomphale, Borodin's In the Steppes of Central Asia, Brahms's Triumphlied or Prokofiev's Hail to Stalin.
I take your point although I'm unsure about a couple of your examples. My understanding is that the Berlioz is an
In memoriam work and the inclusion of the Borodin seems tantamount to suggesting that those works composed for Brenda's coronation are political! But then my use of the word "political" is probably far too exclusive. I suppose it might be useful to delineate the boundaries, if indeed that is possible.