Symphony No. 1 (Mozart) in the finale of his "Jupiter" symphony, No. 41. The four notes, Do, Re, Fa, Mi, make an appearance in several of Mozart's works, including his Symphony No. 33. This theme is stated by the horns in his first symphony. In his book on the Piano Concertos, Cuthbert Girdlestone pointed out the similarity between the opening of this symphony and that of Mozart’s Piano Concerto No. 22 K482, composed some twenty years later. Symphony No. 1 (Mozart) The Symphony No. 1 in E major, K. 16, was written in 1764 by Wolfgang Amadeus Mozart at the age of eight years.
Symphony No. 7 (Sibelius) 1", a "symphonic fantasy". The composer was apparently undecided on what name to give the piece, and only granted it status as a symphony after some deliberation. For its publication on 25 February 1925, the score was titled "Symphony No. 7 (in one movement)". The concept of a continuous, single-movement symphony was one Sibelius only reached after a long process of experimentation. His Symphony No. 3, dating from 1907, contained three movements, an earlier fourth movement having been fused into the third. The final result was successful enough for Sibelius to use the same idea in his Symphony No. 5,