Added another image to the 19th century timeline (2nd half). What is it about trombonists?
c. 1870—Carl Bernhard Schloesser’s Une Repetition General depicts a lively band rehearsal, probably in the Black Forest region. A mixture of young and old players are represented, the trombonist taking a break to refresh himself (see above lithograph by Thielly after Schloesser; public domain).
Update: Alert reader Chuck Wilson points out that the flags shown in the image do not match the Black Forest region of Germany; rather, the painting is probably set in the Swiss canton of Neuchatel.