Travis and Lauren Cartee
The Audio Gutenberg Blog has all the recordings of Luther's Galatians on the page linked.
Galatians is Luther's finest work, along with the Small Catechism.
On YouTube, this is the headquarters of Audio Gutenberg. Subscribe to the series and like the videos in increase its visibility.
The Solid Declaration of the Formula of Concord
III. The Righteousness of Faith
6] This article concerning justification by faith (as the Apology says) is the chief article in the entire Christian doctrine, without which no poor conscience can have any firm consolation, or can truly know the riches of the grace of Christ, as Dr. Luther also has written: If this only article remains pure on the battlefield, the Christian Church also remains pure, and in goodly harmony and without any sects; but if it does not remain pure, it is not possible that any error or fanatical spirit can be resisted. (Tom. 5, Jena, p. 159.)
67] Concerning what is needful furthermore for the proper explanation of this profound and chief article of justification before God, upon which depends the salvation of our souls, we direct, and for the sake of brevity herewith refer, every one to Dr. Luther's beautiful and glorious exposition of the Epistle of St. Paul to the Galatians.