Assertion: clavichord's key | /r/AtLocation | use
Facets:
value: commonly
type: TEMPORAL
Source sentences:
text: As the term was used in the 17th century, "Well tempered" meant that the twelve notes per octave of the standard keyboard were tuned in such a way that it was possible to play music in all major or minor keys that were commonly in use, and it would not sound perceptibly out of tune (Duffin 2007, 37).