1 in E♭ major, K. 16, is a symphony written in 1764 by Wolfgang Amadeus Mozart at the age of eight years.

The autograph score (handwritten original) of the symphony is today preserved in the Biblioteka Jagiellońska in Kraków.

[1][2] The house at 180 Ebury Street, now in the borough of Westminster, where this symphony was written, is marked with a plaque.

The work shows the influence of several composers, including his father and the sons of Johann Sebastian Bach, especially Johann Christian Bach, an important early symphonist working in London whom Mozart had met during his time there.

The four notes, C, D, F, E, make an appearance in several of Mozart's works, including his Symphony No.