Tromba dell'Imminenza

The fourth in the Tromba series is a departure from the earlier, mostly diatonic entries and is highly chromatic, with a generous measure of stacked fourth/fifth harmonies as well. However, lovers of spiky dissonance will be disappointed, particularity as it ends on a friendly, one might even say cheerful, Ab Major chord.

Yes, the Salisbury Tuba makes an appearance, along with Mr. 32' reed.

Those who like scores bristling with accidentals can find such a one attached.