||Festival Tantum Ergo
||Festival Tantum Ergo for Solo, Quartett, Chorus and Organ
||1885-02 or earlier
||1881 – New York: Wm. A. Pond & Co.
||Rev. John J. Kean, Pastor of St. James' R.C. Church.
||Soloists, vocal quartet, chorus and organ.
Apparently one of two works of Brandeis published as Op.63 by Pond (Das versunkene kloster followed the next year).
A performance is mentioned in the February 28 1885 "Boston Transcript". (Probably performed earlier, yes.)
The New York Times of January 8 1882 , under "Music and Musicians", (PDF archive of this available at their website) noted the publication of this work and gave a very brief appreciative review (in which the composer is described as "the well-known composer and organist of this city" (New York).