Solo for trumpet or cornet with piano accompaniment.
Quatre Variations sur un Theme de Domenico Scarlatti pour Trompette Si b ou Cornet et Piano composed by Marcel Bitsch (1921-2011).
For Bb trumpet or cornet and piano, published by Alphonse Leduc (AH.AL20776).
Here is a relevant article (PDF) about the piece from the Trumpet Guild by Bryan Proksch.
Here is an excerpt from variation 4 played by Daniel Birnschein: