Bruckner at first conceived the slow movement of the First in classical sonata form with development, but for the Linz version he finally decided in favour of a three-part structure with an elaborately composed middle section. The autograph of the original Adagio (now in the Music Collection of the Austrian National Library), still without trumpets or trombones, breaks off at bar 154 in the recapitulation of the second subject. One sheet of the score still exists from the close of the movement (...