I'm involved with a radio station in my area and it's soooooo cool to sit in on shows. All of the stuff you hear is done by live humans. They go in and manually put CDs and curate the playlists and control the levels of everything. Sometimes they talk in between with some context for the song or random musings they have. Sometimes whoever is hosting will dedicate a particular song to somebody they know. It's so endearing and human. Occasionally they'll have a prerecorded show but most of them are live.