Assertion: harmonica's key | /r/HasProperty | perfect
Facets:
value: below the key of the harmonica
type: LOCATION
value: for playing situation
type: CAUSE
Source sentences:
text: These keys are perfect for almost all playing situation.
text: More common (especially in blues and rock) is "crossharp" or "second position" playing which involves playing in the key which is a perfect fourth below the key of the harmonica (for example, on a C tuned harmonica, a second position blues would be in G—resulting in the instrument playing in mixolydian mode).