Ask HN: Is there anything like GPL for songs?

I haven't checked all the options about Creative Commons licenses, but even if I downloaded some albums published under any of the CC licenses, I usually never get what I get with GPL software. GPL software makes source code available and free to modify. I'd like something like that about songs. I want to be able to download a song and all the audio tracks, stems, etc that made that track possible. I want to publish a song and make people able to use the samples for their own productions, remixes, etc.

Maybe there are options already but I don't know them. I know of places like ccMixter, but why is not normal to publish CC songs this way?

Thanks in advance for you comments.