Ein' feste Burg ist unser Gott, Op. 27
... that Max Reger composed the chorale fantasia Ein' feste Burg ist unser Gott, Op. 27, for Karl Straube, who premiered it before it was published?
... that <a href="./Max_Reger" id="mwAVk" rel="mw:WikiLink" title="Max Reger">Max Reger</a> composed the chorale fantasia <b id="mwAVo"><a class="mw-redirect" href="./Ein'_feste_Burg_ist_unser_Gott,_Op._27" id="mwAVs" rel="mw:WikiLink" title="Ein' feste Burg ist unser Gott, Op. 27"><i id="mwAVw">Ein' feste Burg ist unser Gott</i>, Op. 27</a></b>, for <a href="./Karl_Straube" id="mwAV0" rel="mw:WikiLink" title="Karl Straube">Karl Straube</a>, who premiered it before it was published?