Kirk Mcehlhearn wrote a detailed breakdown about Apple's new classical music app for TidBITS last month.
Apple Music Classical Mostly Plays the Right Chords:
Apple Music Classical is a free app for Apple Music subscribers to access this new, enhanced collection of music. Inexplicably, it is only available for the iPhone. One would expect Apple Music Classical to be available for desktop computers, especially since many people listen to classical music from a Mac, or a PC running iTunes, connected to a stereo. Since Apple Music has added a lot of high-resolution music, which requires an external DAC (digital-analog converter) to play at its full quality, it is quite difficult to play that sort of music from an iPhone. You can stream music to an AirPlay 2-compatible receiver with a DAC attached, but most people don’t have that hardware. You can, of course, stream Apple Music Classical from an iPhone to a HomePod—the second generation of which also supports Dolby Atmos, or what Apple calls spatial audio—but overall, this focus on the iPhone limits playback options considerably. Keep reading here...: