存著再看年 09:10 音乐基础 Clarinet: Interview and demonstration with principal Jon Manasse | 音乐 | Khan Academy
存著再看年 02:13 音乐基础 Lesson 5: Review of time signatures – Simple, compound, and complex | 音乐 | Khan Academy
存著再看年 06:34 音乐基础 钢琴 (as orchestral instrument): Interview and demonstration with Kimberly Russ | Khan Academy