Missa Sancti Nicolai (Mass no. 6 in G major, Hob XXII:6, also known as the Nicolaimesse) is a mass by Joseph Haydn, composed around 1772 and revised in 1802.
The work is scored for SATB soloists and choir, two oboes, two horns, strings, and organ. The revision added trumpets and timpani.
References
Missa Sancti Nicolai Wikipedia(Text) CC BY-SA