@georgem: No site exists like devtome for music, so nobody has earned DVC from it. 
There are not enough admins for a music site.
It's not just that. For art and music in particular, free is not the same as open-source or at least the scale of licensing matters a lot. Open-source means being relinquishing the 'source'. Markm wrote about this in the past, that such forms might amount to the core or stepped design process as well as the finished article. So yes that requires people and expertise, but is also requires artists being willing to release the model, layers, components - source. To be able to broadly utilise open-source people have to be ablt to tweak it, change it, adjust it without necessarily going back to the originator. You can't do that with a complied or locked finality without having all the constituent bits that make up the ends. There are not enough admins for a music site.Yes ok, but wait a minute. If I were to be a voice artist, willing to create copyright free (creative commons) voice samples , does open source in the broader sense mean that I have to give the world access to my vocal chords, so they can tweak my voice the way they like?
At what point does this argument sound completely ridiculous?
I think a devtome for musicians would have to be about free music, meaning the artist has agreed to give the music away for free (well not really, he hopes to earn some DVC) and if available free transcriptions of the notes played (if composition, etc) but open source is not really valid at all with an artform like music, because the musician himself is the source, and he is not going to be able to share his body and spirit not even if he wanted to.
So maybe we shouldn't be so fixed on this definition of open source, because some artforms will simply not work with that definition anyway.
We would need a voice, and instructions about what it should say or do.
If your voice sounds different from some other voice, we ought at least have some generic modifiable voices or categories of voice, so we can categorise your voice as being either a voice of a certain category or a voice such as one might get using a certain set of filters/modifiers as input to a voice simulator.
Basically if voice synthesisers cannot yet produce a voice such as yours they need improving, and we want the open source version of such a voice-synthesiser.
We do not want a recording of you singing the song with your closed source human voice, we want the instructions as to how a voice is to be used to sing the song, maybe with some hints as to what kind of voice might perform it best for what kind of audience. (Maybe some audiences would prefer to hear it in a gruff voice, others in a soproano voice, others in a male voice, others in a femail voice, others in a unisex or roboti voice and so on and so on.)
We want source code for how to go about singing such a song.
-MarkM-
I'm kind of confused by why this project would exclude a musical equivalent of Devtome. The equivalent of what you're describing for writing would be an AI that can output readable and uniquely stylistic prose, but that's not what Devtome asks for. It relies on human generated content and the ability to share and remix that content. How are people going to crawl into my closed source brain to see how I think of topics, conceptualize storylines, and string sentences together? Would there be a category that said, "I want a low-sci-fi voice tagged first-person and dark humor vs an academic voice tagged archaic english lexicon?" (Definitely an interesting concept that I wouldn't have thought of without this discussion). It seems more practical to put the writing up, and also put explain the writing process if there's enough interest for it.
I think the CC BY-SA license and opensource are highly compatible concepts, but they're not strictly the same thing. There might be a demand for open-source voice synthesizers and that is a very different project than human generated content that is not locked away by copyright. Both are valid, and the degree of their implementation will depend on the demand.