Assertion: bass trumpet | /r/HasProperty | built in e♭
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: It is usually pitched in 8' C or 9' B♭ today, but is sometimes built in E♭ and is treated as a transposing instrument sounding either an octave, a sixth or a ninth lower than written, depending on the pitch of the instrument.