Charles M. Bogert

Audio documentary is a narrative non‑fiction form created specifically for listening. It blends reportage, interviews, archival tape, field recordings, narration, and montage to present real events, people, and ideas. Unlike audio drama, which stages fiction with actors, audio documentary prioritizes factual storytelling and journalistic ethics while borrowing dramatic structure, pacing, and sound design to deepen engagement. Its craft relies on careful research, on‑location sound, and editorial shaping to build scenes and a clear point of view.

Nature recordings are unaccompanied, minimally edited captures of natural soundscapes such as birdsong, wind, rain, surf, rivers, amphibians, insects, and other environmental ambiences. The emphasis is on documentary fidelity, long-form listening, and preserving dynamic range rather than musical composition in the traditional sense. Releases often present extended, uninterrupted tracks from a single habitat or time window (e.g., dawn chorus, coastal storm, tropical rainforest at night), inviting listeners to experience place through sound. While closely related to field recording and soundscape composition, nature recordings typically avoid added instruments or overt sound design, privileging biophony and geophony with as little anthrophony (human-made noise) as possible.

Country blues—also called rural blues or folk blues—is the earliest widely documented form of the blues, rooted in the everyday music-making of African Americans in the rural American South. It typically features a solo singer accompanying themselves on acoustic guitar, with flexible time, expressive vocal delivery, and abundant use of blue notes. While 12‑bar structures are common, country blues often stretches or compresses measures to fit the lyric, making phrasing elastic and conversational. Regional flavors emerged—Delta (driving, droning thumb bass and slide), Piedmont (ragtime‑inflected fingerpicking), and Texas (looser phrasing and single‑string leads)—but all share storytelling lyrics about work, travel, love, hardship, and spiritual longing.

Animal sounds is a non-music, documentary-focused genre centered on the unaccompanied vocalizations and behaviors of animals—such as birdsong, whale song, insect choruses, amphibian calls, and mammal vocalizations—captured in the field. Rather than emphasizing melody, harmony, or beat, works in this genre present the acoustic ecology of a place and time. Producers often favor minimal processing to preserve scientific, educational, and experiential value, though some releases organize recordings into thematic "soundscapes" (e.g., dawn chorus, coastal rookeries). The genre is commonly used for education, research, relaxation, and as raw material for ambient, electroacoustic, and sound art contexts.

Bird sounds is a non-music audio genre centered on the recording and presentation of avian vocalizations—songs, calls, alarm notes, wing sounds, and choruses—captured in natural habitats. Releases typically feature unprocessed or minimally edited field recordings that highlight species identification, behavior, and ecological context. While often issued as documentary or educational material for ornithologists and birders, bird-sound albums have also been widely used for relaxation, meditation, film and game sound design, and as source material in electroacoustic and ambient composition. Projects range from single-species studies to immersive “dawn chorus” soundscapes and region-focused guides.

Lecture is a spoken-word audio genre centered on the delivery of information and ideas by a single speaker (or a small panel) to an audience. It prioritizes clarity, structure, and rhetorical craft over musical accompaniment, with production focusing on intelligible voice capture and minimal sonic distraction. As a recorded format, lecture evolved from public oratory and classroom teaching into publishable audio: first on phonograph cylinders and 78 rpm discs, later on LPs, cassettes, CDs, and today via digital streaming, podcasts, and open courseware. Topics span philosophy, science, social theory, religion, psychology, technology, and public policy. A typical lecture has an introduction that frames the thesis, a body that progresses through signposted sections and examples, and a conclusion that synthesizes takeaways—sometimes followed by audience Q&A. Audience ambience, brief applause, or light cues may be present, but music beds are rare or restrained.