Back in the 50's, Clark Ashton Smith recorded himself reading some of his poetry with a friend, which then went on cassette in the 90's. This cassette is fairly rare now, so when I saw one available for fairly cheap, I grabbed it and digitized it so that it would be better preserved. You can get the file for the audio, and files for scans of the booklet that came with it, below:

The Elder Tapes recording: https://archive.org/details/clark-ashton-smith-live-from-auburn-the-elder-tapes

Scans of the booklet and cassette: https://archive.org/details/clark-ashton-smith-live-from-aubrun-the-elder-tapes-booklet-and-cassette/Clark Ashton Smith Live from Aubrun The Elder Tapes Booklet/

The first voice is a friend introducing him. The voice reading the poetry is Clark Ashton Smith. He sounds a bit different from how I imagined him, which I assume is due to his age. I am a little saddened that we don't have a recording of him reading "The Hashish Eater", though.