Encyclopedias provide short, readable entries so that you can gain facts and a general overview of a topic.
Sometimes an entry's bibliography can lead you to more sources about your topic.
Link to the slideshow presentation on the history of Grove Music: https://docs.google.com/presentation/d/1scY6T18F5zvehT-iSQlvyWGddGPobE9PcXFVH6rrzHo/edit