Because the songs included have good sound quality.

This sound quality is absolutely unmatched by streaming platforms (of course, the 100-bit master sound source is the best. If it is ordinary music, it is useless to softly improve the sound quality. You have to judge this by yourself. ) Of course, the device you listen to must support high-resolution lossless music, otherwise no matter how good the sound quality is, you won’t be able to achieve it.