1. 和谐的：tuned-in 好赶时髦的 | tuneful 和谐的 | tuneless 不和谐的

2. 音调谐美的：音调显示器tonoscope | 音调谐美的tuneful | 音调优美的canorous

3. 悦耳的：11. Melody 旋律 | 12. Tuneful悦耳的 | 13. Lyrics 歌词

4. 和谐的/音调谐美的：tuned-in /好赶时髦的/ | tuneful /和谐的/音调谐美的/ | tuneless /不合调的/不悦耳的/

1. 音调悦耳的;曲调优美的
A piece of music that is tuneful has a pleasant tune.

adj

1. having a musical sound
especially a pleasing tune

Synonym: melodious