Hi there Aenq,
Thank you for posting to Apple Support Communities.
We understand you're having a problem with Apple Music Classical playing in Spatial Audio with Dolby Atmos. We'd like to help. Take a look at the requirements here:
"Choose how to listen to Dolby Atmos on your iPhone or iPad
- Update your iPhone or iPad to the latest version of iOS or iPadOS.
- Go to Settings.
- Tap Music.
- Under Audio, tap Dolby Atmos.
- Choose Automatic, Always On, or Off.
If you choose Automatic, here’s what you need
Supported songs automatically play in Dolby Atmos when you're listening with:
- AirPods Pro, AirPods Max, AirPods (3rd generation), or Beats Fit Pro with Spatial Audio turned on
- AirPods (1st or 2nd generation)
- BeatsX, Beats Solo3 Wireless, Beats Studio3, Powerbeats3 Wireless, Beats Flex, Powerbeats Pro, Beats Solo Pro, or Beats Studio Buds
- Any Bluetooth headphones that you categorize as headphones on your iPhone or iPad
- The built-in speakers on an iPhone XS or later (except iPhone SE), iPad Pro 12.9-inch (3rd generation or later), iPad Pro 11-inch, or iPad Air (4th generation or later)
If you choose Always On, here’s what you need
If you want to use wired headphones, choose Always On."
About Spatial Audio with Dolby Atmos in Apple Music - Apple Support
Let's start with that. Let us know if you have any questions.
Take care.