In particular I am interested in lectures that cover the Major Eras (Early, Medieval, Renaissance, Baroque, Classical, Romantic, etc.), i.e. a survey course.
I very enjoyed Schickele Mix, and wonder if there is a similar lecture where music and lecturing are balanced. I have listened to some of "The Great Courses" lectures, which are almost all by Robert Greenberg, but find that there is too much talking relative to the music.