A song without sound source in QQ music means that the copyright of the song has not been purchased by QQ music platform, so users can't listen to or download the song on QQ music platform.

If users like this song very much, they can try to search and download the audio file of this song through other channels such as search engines, music forums or third-party download websites. However, it should be noted that non-genuine audio sources may infringe copyright, and it is recommended to download and use them within the legal scope.