The Library of Congress' photostream / Tags / dc:identifier=httphdllocgovlocmusicgottlieb01931

(The Library of Congress is the only person who has used "dc:identifier=httphdllocgovlocmusicgottlieb01931" as a tag.)

What are tags?
You can give your uploads a "tag", which is like a keyword. Tags help you find things which have something in common. You can assign up to 75 tags to each photo or video.