Schubert's Symphony in D major, D 2B/997, is an unfinished work that survives in an incomplete 30-bar orchestral score.
Its instrumentation is for the standard early Schubertian and classical orchestra, with the addition of trombones.
Schubert authority, conductor, and composer Brian Newbould suggests that the piece was modelled on Ludwig van Beethoven's second symphony.
Newbould states that the presence of trombones does not fit well with early Schubert's orchestral style and notes that they "have nothing special to contribute.
... Perhaps he was merely obeying one of those headstrong impulses that impel the young to run before they can walk."