Montgomery Rufus Karl Siegfried Straube, born 6 January 1873 in Berlin, was a German organist who became the long‑time Thomaskantor of Leipzig. After early self‑instruction under his father, organist Johannes Straube, he secured a position at the Willibrordi Cathedral in Wesel in 1897, where he premiered several works by Max Reger. In 1903, he moved to the St. Thomas Church, later becoming a professor at the Royal Conservatory of Music in Leipzig and a founding director of the Institute of Church Music. Straube’s career peaked with the 1931–1937 radio broadcast of all J.S. Bach cantatas. He also championed Reger’s organ works and influenced the German organ movement through his editorial series Alte Meister des Orgelspiels. After stepping down as Thomaskantor in 1939, he continued teaching until his death on 27 April 1950 in Leipzig.