Assertion: bass tuba | /r/Desires | additional tubing length
Facets:
value: beyond that
type: OTHER
value: to play down
type: PURPOSE
Source sentences:
text: The bass tuba in F is pitched a fifth above the BB♭ tuba and a fourth above the CC tuba, so it needs additional tubing length beyond that provided by four valves to play securely down to a low F as required in much tuba music.