Guitar,Instrumental Duet - Level 2 - Digital Download SKU: A0.691186 Composed by Martin Luther. Arranged by Mark Phillips. Praise & Worship,Sacred,Spiritual. 2 pages. A. J. Cornell Publications #3033801. Published by A. J. Cornell Publications (A0.691186). A Mighty Fortress Is Our God (hymn) for easy classical guitar duet, with tablature.