01 · 认识键盘
PDF · 4 页 · 黑键 2 + 3、C、七个音名、升降号4 pages · black-key groups of 2 + 3, C, seven note names, sharps and flats
COURSE MATERIALS / 课程课件
KEEP PRACTICING保持练习
免费基础课现在由四节组成：认识键盘、音程、三和弦、三和弦转位。每节横向 PDF 都可以单独打开或下载，再回到琴上跟着示例练习。The free foundation course now contains four lessons: keyboard orientation, intervals, triads and triad inversions. Open or download each landscape PDF and bring every example back to the keys.
02 · 音程
PDF · 7 页 · 半音全音、二度三度、纯四度与纯五度7 pages · half and whole steps, seconds, thirds, perfect fourths and fifths
03 · 三和弦
PDF · 5 页 · 大、小、增、减三和弦与常见标记5 pages · major, minor, augmented and diminished triads with common symbols
04 · 三和弦转位
PDF · 5 页 · 原位、第一转位与第二转位5 pages · root position, first inversion and second inversion
ARCHIVE / 旧版存档
第 1–5 课精简练习版
此前已经发布的 8 页练习课件继续保留，原下载链接不变，方便已经使用过这份资料的学习者继续查阅。The previously released eight-page practice booklet remains available at its original link for learners who are already using it.
旧版第 1–5 课精简练习版
PDF · 8 页 · AaronL.Keys
