David Johnson's Trumpet Tune in D Major is an energetic piece written in baroque style. Thanks to it's roots in the English school of organ building, the Haverhill OIC sample set renders this piece beautifully. The tuba on this organ is stunning, and this piece showcases it effectively.
The extended version of the Haverhill OIC sample set is used in this video. The original instrument is 3-manuals with 42 stops. The extended set has 4-manuals (the solo reeds may be played with a solo manual) with 59 stops. David Butcher from Lavender Audio made some very thoughtful additions in the extended set.