The use by artists of the camera obscura (literally dark room) began in:

The use of dark room in developing pictures began in the 18th Century. Dark room is also known as Camera Obscura in Latin. The room is made dark to develop pictures using photographic materials like the film and photographic papers.  

explanation:

“blowin’ in the wind” was composed by bob dylan. most of bob dylan’s first songs trafficked with particular circumstances or people. at the newport folk festival, bob dylan was supported by the paul butterfield blues band. woody guthrie composed “this land is your land” as a response to irving berlin’s “god bless america.”like a rolling stone” held the long-drawn 45 rpm single that became always been taped. protest tunes normally include mild themes. bob dylan’s earliest collection to incorporate electronic melodies was returning it all back home. pete seeger never contracted with a dominant record name as a solo musician. most of the byrds’ initial records were covers of folk melodies.