原文: Progressive Keyboard Method 2. Book and CD. Sheet Music, CD. Keyboard. KBD. Introduces seven new chords and another 40 songs.
译文: 渐进式键盘方法2. 书和CD. 乐谱，CD. 键盘. 大骨节病. Extends the range of notes to cover the chromatic scale up to the A above the treble staff.
