A Mighty Fortress Is Our God arranged for full orchestra, SATB choir with piano/organ and optional congregation. Key of C. This can work as an instrumental feature as well. This is an epic musical tribute to this great hymn which will be sure to bring a grand celebration to any service. View the full sample score in PDF while listening to the midi audio of this work. See the score for a list of instruments. Note that there are sub parts for Bb treble baritones and tenor saxes.