Assertion: electronic dance music | /r/AtLocation | one form
Facets:
value: since at least the early 1970s
type: TEMPORAL
Source sentences:
text: Electronic dance music, or EDM as it's somewhat controversially called these days, has existed in one form or another since the advent of the first drum machine.
text: Chicago and Detroit Electronic dance music has existed in some form since at least the early 1970s.