The Symphony No. 5 in D major/D minor, Op. 107, known as the Reformation, was composed by Felix Mendelssohn in 1830 in honor of the 300th anniversary of the Presentation of the Augsburg Confession. The Confession is a key document of Lutheranism and its Presentation to Emperor Charles V in June 1530 was a momentous event of the Protestant Reformation. This symphony was written for a full orchestra and was Mendelssohn’s second extended symphony. It was not published until 1868, 21 years after the composer’s death – hence its numbering as ‘5’. Although the symphony is not very frequently performed, it is better known today than it was during Mendelssohn’s lifetime.

(from Wikipedia)

Symphony No. 5 in D Major, Op. 107, "Reformation"
By Felix Mendelssohn
Composed in 1830