Yes. Film consisting solely of a recorded sound track — with no visual image — is still classified under heading 3706 rather than under audio-recording headings, because the heading text explicitly includes film 'consisting only of sound track.' The physical medium (developed cinematographic film) governs classification over the content type.

Subheading 370610 covers developed motion-picture film that is 35 mm wide or wider, which includes standard theatrical release prints and large-format (70 mm) prints. Subheading 370690 covers all developed motion-picture film narrower than 35 mm, such as 16 mm and 8 mm formats used in educational, archival, and amateur contexts. Width at the time of importation is the sole dividing criterion.