Provide a transcript for any audio-only content.
Deaf or hearing impaired users need a text alternative to make audio-only content accessible.
Transcripts can be placed on a separate page, a link to which can be added next to the audio-only content.
WebAIM Article on Captions, Transcripts and Audio Descriptions
WCAG Success Criterion 1.2.1 Prerecorded Audio-only and Video-only