I usually avoid sites like this (wikis, encyclopaedias, etc - they're easily found) however this one has photos from the Great Depression so I thought it worthwhile. The faces are harrowing.
An extensive collection of texts and images detailing many aspects of life in the South during the twentieth century. Seems to focus on 'everyday' history rather than the big events. But then again history is about people, isn't it?
It looks like these audio clips from the C20th are freely available, however you might have to join the site and as my broadband has almost run out I can't check. At least some are free. Focuses on the US, by the looks of it.