Assertion: zither's music | /r/AtLocation | the united states
Facets:
value: in the 1920s
type: TEMPORAL
Source sentences:
text: Similar instruments were being produced by American companies of the same time period, often with Hawaiian-inspired names, such as Hawaiian Art Violin or Violin-Uke, and marketed for use in playing the Hawaiian music, which was popular in the United States in the 1920s.