base chord

例句：

1. 1. The bass chord is the foundation of the music piece.
   这个基础和弦是这首音乐作品的基础。
2. 2.The melody is a base chord that sets the tone for the entire song.
   旋律是一个基础和弦，为整首歌定下了基调。
3. 3. In jazz music, the bass chord is often used to create a deep and soulful sound.
   在爵士乐中，低音和弦通常被用来创造深沉而富有灵魂的声音。