Annotated links to quality history websites listed by time periods, starting with 1492 to current times. Scroll down to move through time to the present. Try the new interface before it goes live in May: http://www.digitalhistory2.uh.edu/
Listen to American music from the early 1900s to present through the National Jukebox historical recordings from the Library of Congress project. Includes history of music and recording technology too.