I was just listening to Salvatore Martirano’s Underworld and I realised that there’s just not enough evil cackling in modern music. Underworld is probably the monarch of this petty kingdom, although Frank Zappa was probably the most prolific contributor to the genre, most notably in The Chrome Plated Megaphone of Destiny, in addition to sundry appearances in RDNZL and elsewhere. Karlheinz Stockhausen also gets off a particularly good one in Der Jahreslauf.
Apart from these I’m drawing a blank. I suspect there are further examples lurking amongst the later works of Stockhausen, and possibly in one or two of Kenneth Gaburo’s pieces. This sorry state of contemporary music reflects a general dearth of evil cackling these days. Even the worst of evildoers are so cowed by political correctness that they now feel obliged to pretend their nefarious deeds are committed for the greater good. If only they could show they were getting some enjoyment out of their evil, then the world might start to make sense again.
UPDATE 2: of related interest.