I wrote:

>>It the first theme (after the short slow introduction) of the first
>>movement of Schubert's Symphony No. 5 and it's in B flat.

Stephen E. Bacher queried:

>And have you ever noticed that the "short slow introduction" is virtually
>identical to the choral motif from the first movement ("Selig sind") of
>Brahms' German Requiem.

By golly!  I hadn't. It always reminded me of those slow chords that
open Mendelssohn's Overture to Midsummer Night's Dream, although it's
the idea of a very brief chordal intro, not the harmonies themselves.

Scott Morrison