Found this set of 1942 music book covers on Flickr belonging to Kyle Katz. According to Katz, the Bach and Beethoven covers each appear to have been designed by George Marek, but the latter strongly resembles the work of Alex Steinweiss I must say. My suspicion is that Marek is the author of these two books. Brahams and Wagner is written by Robert C. Bagar. Mozart by Irving Kolodin, and Tchaikovsky by John Halliday. If anyone knows the designers on these covers, please clue the rest of us in.