Assertion: double bass's string | /r/HasProperty | octave
Facets:
Source sentences:
text: In the United States, Canada and United Kingdom, most professional orchestral players use four-string double basses with a "C extension," which extends the lowest string down as far as low C, an octave below the lowest note on the cello.
text: In the United States, Canada and United Kingdom, most professional orchestral players use four-string double basses with a "C extension," which extends the lowest string down as far as low C, an octave below the lowest note on the cello.