For your consideration: a pipe organ improvisation performed by John Zorn. Drones, throbs and horrific stabs. Good stuff. Zorn’s claimed that the pipe organ was his first instrument, and the soundtrack to Lon Chaney’s silent films was deeply influential. Easy to see that here, though there is a form of weird meditation amongst the clusters.
Fun fact I discovered this morning: from the 1700s, the pipe organ was the most complex human creation until the invention of the telephone exchange. From singular communication to conversation.
Zorn speaks about the performance here: