In terms of human voice. Tsai Chin's and Faye Wong's voices are both good. Recommended tracks include Ferry, Sky. Sarah Brightman's "Moon Goddess" Enya's music is also good. In addition, Tengger's vocals are full of energy and explosive power, which is also very suitable for listening to the recommended tracks. A more classic tune like Eagle's Hotel California is also suitable. Yan Xuemin's "The First Drum of Yanhuang" is also a good CD to burn in. In addition, the audition disc like Swans has a wide range of tracks and is also very suitable for burning headphones.