It is always difficult comparing Popular Musicians with Classical Composers. In FZ case the door is open to do that because he had some aspirations in Symphonic Music. No, he wasn’t J.S. Bach. As you rightly note, most Composers are going to pale compared to J.S. Bach. A more apt comparison may be the Romantics such as Brahms, Dvorak, and Grieg. These guys had one foot in the door of popular music-most of their income came from sheet music sales from stuff that was comparatively simple—but, like Mozart, they frequently took simple song forms and ran with them, turning them into much more complicated works