A 'grave' Toccata by Alessandro Scarlatti, recorded on the Krzeszow Organ by Michael Engler (1732-37), a very nice sample set by Sonus Paradisi.
Pietro Alessandro Gaspare Scarlatti (2 May 1660 – 22 October 1725) was an Italian Baroque composer, known especially for his operas and chamber cantatas. He is considered the founder of the Neapolitan school of opera. He was the father of two other composers, Domenico Scarlatti and Pietro Filippo Scarlatti.
More about this composer: https://en.wikipedia.org/wiki/Alessandro_Scarlatti
This piece is played with 16ft Plenum with reeds in the Pedal.
Enjoy the rich sound! I hope you'll like it.