Stumbled across this incredible performance of the above piece on cornetto with organ (YouTube link):
https://www.youtube.com/watch?v=7pt7q5XqjHg
Castello (1602-1631, a tragically short life) was a Venetian composer of the early baroque. He was among the first to publish sonatas for a solo instrument plus basso continuo.
The cornetto is a brass instrument made of wood, with finger holes. Recorder meets trumpet.










