A visual timeline of Motown is a nice combination of imagery, blurbs and points across time. There are soundclips in various spots along the way. You can slide the slider horizontally to move year by year or you can jump in 3 year increments by clicking the images above the body of the timeline. The imagery here is critical to the experience of the information, often using larger images to highlight the more popular or groundbreaking musicians. Done in flash, this is another well designed and usable example.