Samama Leo acted as chairman of the jury for the «4Viola» Composition Contest, which led to the submission of 86 brand new pieces for viola quartet. I am currently in the process of working those inputs (where so permitted by their authors) into the DVS Catalogue of Viola Ensemble Music.
This serenade has the subtitle "Verwante zielen" (Related Souls), and was composed for (and premiered by) the Dutch sisters Annette and Gisella Bergman, both professional violists. Their recording is available on YouTube: https://www.youtube.com/watch?v=cdSozYmUgS0
To be clarified if this is a duplicate of the Mass in F by W. Byrd, transcribed by Thoma (listed separately). The XPT listing implies that Thoma has added some musical content of his own, next to (not just being a pure transcription of) Byrd's original music?