RAW Semantics does a nice public service by posting the YouTube video for the audio for Secrets of Power, a 40-minute comedy recording of Robert Anton Wilson released in 1986 in the UK. I believe it's one of the few commercial audio recordings of RAW I haven't heard, so I'll check it out this weekend. In his post discussing the recording, Brian writes, "My first sampling of RAW was ‘Secrets of Power’ – a cassette tape that I bought from a London record shop, around 1986. At the time, I’d never heard of Robert Anton Wilson." For your convenience, I've posted the video here, but you should read Brian's comments.
If you like RAW audio, don't forget the other recordings available at at YouTube, and don't overlook all of the audio available at the Internet Archive. Start perhaps with Robert Anton Wilson: The Lost Studio Session and then explore.