Library of Congress
Making Sense of Documents - this includes historical songs
Authentic History Center - great place to locate pictures, documents, videos, audio productionsStories from the Smithsonian Institute
The Portal to Texas History - I have to put this resource in since I'm a Texan. I'm sure if you do a google search for your city, state, country, you'll be able to find fantastic sites.
Lone Star History Links
Historical Photographs and Documents from the Smithsonian
Dust Bowl Photographs
Dust Bowl Audio Files, Maps, Photographs- Listening to families tell about their hardships is amazing and insightful!