Assertion: saxophone's sound | /r/CapableOf | sing with clean vibrato
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Source sentences:
text: Even so, at least one musician did not give up hope that the saxophone could become a well-respected classical instrument: in the 1950s, saxophonist Marcel Mule helped show that, in TIME’s words, the instrument could produce “an open, evenly controlled sound that could sing with a clean vibrato or a finely trimmed staccato, swell robustly and solidly with no trace of the breathy ‘air sound.'