As stated on the official website, "marble sky records" is divided into 3 labels: solfa, luminouscore, madaranosora.
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http://www.solfa.asia/about.html
luminouscore is used to release soundtracks and vocal collections.
solfa is used to release the albums of the vocalists themselves.
madaranosora used for doujin albums, except for my sound life (it's not exactly because of the lack of scans / photos).
I would also like to note that the site luminouscore died and transferred their function to the website solfa. You can verify this by going to the works tab and see "Copyright(c) 2012 luminouscore All Rights Reserved." at the bottom of the page.
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http://www.solfa.asia/works.html