Lectures given by Dr. Robert W. Yarbrough at Covenant Theological Seminary in 1995.
You can download them for free and give them a whirl, which I (obviously) plan to do. I'm still slowly plodding my way through Schlatter's amazing commentary on Romans The Righteousness of God. Translated, obviously. I wish I was fluent in German but my understanding is that Schlatter could be challenging even for native German speakers.
Knowing German would have made studying Haydn and Hindemith a little easier. Haydn's easy to study here in the U.S. but Hindemith ... sometimes you can't find any cool analysis of his work done by English-speaking scholars but I'm not going to belabor that point too much.