Assertion: double bass's string | /r/CapableOf | lower two half-steps
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Source sentences:
text: or recently nine-string guitars to extend the instrument's range downwards, rhythm guitar for modern metal almost universally uses stepped-down versions of standard or drop D tuning, with professionals and amateurs alike commonly using terminology like “tuning to C” (same pattern as standard tuning, but all strings lowered by four half-steps) or “Drop C tuning” (drop-D tuning lowered two half-steps).