The Witeks' Bach Double

Today I present an early recording of the Bach Double Concerto by a husband-and-wife team that I can find very little information about, Anton Witek and Alma Rosengren-Witek.  He was principal violinist of the Boston Symphony from 1910 to 1918, and most of what I can find out about him online is because of this, since http://www.stokowski.org/ has a page devoted to principal players of the Boston Symphony with a paragraph of information about him here (you'll need to scroll down the page to find it, and it's a big page!). From an article in the New York Times dated May 8, 1926, a preview of which is available here, we learn that Alma Rosengren of Lindsborg, Kansas, had been his pupil before marrying him.  If anyone out there has any further information about these two, I'd love to hear it!  Meanwhile, enjoy their forthright performance of the Bach Double Concerto, obviously made by Columbia to replace their 1924 acoustic recording by Arthur Catterall and John S. Bridge (with Hamilton Harty conducting) which was deleted at the same time this one was issued.  (This Catterall-Bridge recording can be heard at the CHARM website.)

Bach: Concerto in D minor, for two violins and strings, BWV 1043
Alma Rosengren-Witek and Anton Witek, violins
Members of the Bayreuth Festival Orchestra conducted by Ernst Schmidt
Recorded in July, 1928
English Columbia 9681 and 9682, two 78-rpm records
Link (FLAC files, 41.91 MB)
Link (MP3 files, 16.67 MB)

UPDATE (Nov. 20, 2016): Thanks to the recent online accessibility of the Phonograph Monthly Review magazine (1926-1932), I have been able to find out considerably more about this recording, for the July, 1929, issue of that magazine contains a full page about it; apparently Herr Witek himself was interviewed for the article. It was made in the Bayreuth Festspielhaus during the 1928 summer season there, and apparently was the first time a work not by Wagner was played on that stage! The orchestra was composed of members of the Bayreuth Festival Orchestra, of which Witek himself was concertmaster, and they were conducted by Ernst Schmidt, also a violinist at Bayreuth, whose principal claim to fame was that he replaced Karl Muck as the Boston Symphony's conductor, finishing out the 1917-18 season when Muck was arrested and interred as an enemy alien.