May 1921. Washington, D.C. “Charles Seeger, a composer, is a brother of Alan Seeger, the war poet. His wife is a distinguished violinist.” And their baby boy will grow up to be folk legend Pete Seeger.

Ethnomusicologist Charles Seeger, seated in automobile, with family, standing, L-R: wife Constance Seeger, concert violinist, holding son Pete , and sons John and Charles. The family is ready to leave Washington, D.C., for their 1921 “trailer trip” musical expedition to bring classical music to rural areas.

Source: Shorpy Historic Picture Archive :: If I Had a Trailer: 1921 high-resolution photo