Sonbert was also a noted opera critic, and he frequently theorized about the relationship of film to other art forms, in particular, music. He analogized the notes, chords, and tone clusters of music to the progression of shots in film. The shot was the building block upon which Sonbert created the musical rhythms of his films. Sonbert published excerpts from his feature-film screenplay adaptation of Strauss' Capriccio, his favorite opera, in 1986. Short Fuse, completed six years later, can be seen as a return to Capriccio's themes, including 'Nazism and eroticism, beauty and force, detail and structure.' (William Graves) Underscoring a question raised by Capriccio--whether in opera the music or the libretto takes priority--Short Fuse is replete with a soundtrack that counterpoints the film's visuals, prompting the viewer to ask whether the music or the imagery predominates. -- Jon Gartenberg

Carriage Trade was an evolving work-in-progress, and this 61-minute version is the definitive form in which Sonbert realized it, preserved intact from the camera original. With Carriage Trade, Sonbert began to challenge the theories espoused by the great Soviet filmmakers of the 1920’s; he particularly disliked the “knee-jerk’ reaction produced by Eisenstein’s montage. In both lectures and writings about his own style of editing, Sonbert described Carriage Trade as “a jig-saw puzzle of postcards to produce varied displaced effects.” This approach, according to Sonbert, ultimately affords the viewer multi-faceted readings of the connections between individual shots. Preserved by the Academy Film Archive in partnership with Estate Project for Artists with AIDS in 1998.