Assertion: alto sax | /r/HasProperty | e flat instrument
Facets:
Source sentences:
text: Lower in pitch than the soprano, and higher than the tenor, the alto sax is an E flat instrument.
text: The alto sax is an E-flat instrument.
text: However, the alto sax, which is considered an E-Flat instrument, is in the key of Eb, while the tenor sax is in the key of B-Flat, or Bb.