A clown band plays at a children's hospital in the Washington, D.C. area on May 1, 1923. From the National Photo Company collection. View full size.

April 17, 1918. Army Signal Corps music-makers in a logging camp bunkhouse at Hoquiam, Washington. View full size. 5x7 glass negative, George Grantham Bain Collection. Starting in 1917 the Army sent 10,000 soldiers to Oregon and Washington logging camps to cut timber as part of an effort to harvest 10 million board-feet of spruce a month for aircraft construction.

Another view of the Tennessee Troubadour as captured by painter-photographer Ben Shahn in October 1935. View full size. More here. 35mm nitrate negative.

October 1935. Street musician in Maynardville, Tennessee. View full size. Photograph by Ben Shahn. Another shot here. Scan from 35mm nitrate negative.

December 1954. "A novel idea for the audiophile who likes his music wherever he is. A household teacart can be used as a mobile carrier for any combination of audio gear." View full size. Ektachrome by Ken Schmid Studio. Components: Regency HF-150 high fidelity amplifier, Webcor "Diskchanger," Jensen "Duette" reproducer. More from the original press release from Regency Inc.: "Most homemakers are used to wheeling their cleaning equipment with them from room to room -- why not do the same for the entertainment unit that helps to

Pie Town schoolchildren singing. October 1940. View full size. 35mm Kodachrome by Russell Lee. Second boy from the right is "Pops" McKee, interviewed by Paul Hendrickson in the Smithsonian article on Pie Town.