Classically OB. It should come as no surprise. An open baffle's core operational principle of greater room involvement, larger cone surface and categorical absence of box bass with or without port effects lends itself particularly well to classical music. That repertoire contains no electrical bass whose highly damped textures are perhaps best rendered with active sealed speakers based on high-feedback internal class D for maximum control and violent smack. It contains no synth-generated infrasonics to demand bass extension beyond the reach of open baffles. It promotes a listener perspective which is surrounded by copious space and distance to prioritize reflected over direct sound. As a genre, classical music relies on far broader recorded dynamic range—the difference delta between the wispiest pianissimo and the most brutal fortissimo—than compressed Pop that's been mastered for invariable loudness. Finally, the sheer scale and air-motion power of a 60-80-headed symphonic orchestra is perhaps best rendered by the open-backed hence doubled-up displacement surface of dynamic dipoles. Big sound warrants big artillery.
That classical isn't the exclusive domain of old fogies with vast LP/CD collections but just as accessible to inveterate streamers is shown by this spliced screen shot of idagio's purely classical streaming service headquartered in Berlin. Searching by composer and work, in this instance Johannes Brahms with his 3rd Symphony, brings up all available readings by conductor and orchestra. And that's just one example of a cloud-based avenue catering to the specialized search parameters of classical music listeners.
The takeaway is that you can be young, hip and not own a record or CD player yet partake of this repertoire at greater depth than all but the most vociferous of collectors.
If that's you, a Diesis Audio speaker could well be in your future.
Aura at left, Ludos at right.