A Dictionary of Music and Musicians/Ein' Feste Burg
EIN' FESTE BURG. Luther's version of Psalm xlvi. The hymn was probably written at Coburg 1530; the tune seems to have appeared first in 'Psalmen und geistliche Lieder,' Strassburg, Wolfgang Köphl, probably 1538. The form of the tune now in use is that given by Sebastian Bach in various cantatas, especially in that for the 'Festo Reformationis' (Bachgesellschaft, xviii. No. 80), and differs somewhat from Luther's original. The words have also been modernised. We give both words and melody in their first shape from von Winterfeld's 'Luther's deutsche geistliche Lieder.'
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