A few years ago I transcribed a manuscript containing some 20 plus chorale preludes composed by Georg Andreas Sorge. No less than five of them are incomplete, because there are several pages missing from this manuscript. Of one of these 5 there exist only the four closing bars. Not enough to get an impression of the content and the quality of the compositions. The other four, however, are more substantial, varying from about 1/3 to 2/3 of the complete composition.
Like most of the compositions in this manuscript, the 4 preludes of which remains enough to get an idea of there musical substance, are actually quite nice pieces. It would be great if there were some way of restoring the missing parts and create a playable version of how the complete composition could have sounded. Sorge was not one the great masters, but he wrote very nice choral preludes, and the fragments that do exist are very nice fragments of music as well.
So, I decided to try to restore one of these composition by somehow composing the missing parts myself. And I wanted the result to be as close as possible to how the complete original could have sounded by staying faithful to Sorge's style and to the way he composed this type of music. Idealy, a listener should not be able to hear where Sorge's composition breaks of and where my writing takes over.
On my website I write a little more about proces and choices. Story and score available here: http://partitura.org/index.php/georg-andreas-sorge-o-herre-gott-dein-gottlich-wort