Timbre / Sound Quality/(音色/音质) -> Intermediate/(中级) -> Properties of Sounds/(声音的属性) -> Learn/(学习)

Timbre / Sound Quality/(音色/音质) -> Properties of Sounds/(声音的属性) -> Theory/(理论) -> Step 1 Middle School/(第一步初中) -> Years Group/(年级群)

Timbre / Sound Quality/(音色/音质) -> Properties of Sounds/(声音的属性) -> Intermediate/(中级) -> Tier 6 Items Related to Music Education for Children/(第六层音乐教育项目与儿童相关) -> Users Group/(用户群)