Sonos is the first partner to bring support for Apple Music's Dolby Atmos tracks to its speakers, specifically the Sonos Arc and Beam (2nd Gen) soundbars as well as the new Era 300.
The new Era 300 will not be Sonos' only speaker product to support Dolby Atmos music from Apple Music, in addition to Amazon Music. Spotify does not currently offer music in Dolby Atmos.
Also read: Review: Sonos Arc
Starting March 28, support for Dolby Atmos from Apple Music will also be added to the Sonos Arc and Beam (2nd Gen) soundbars which are equipped with additional units for spatial audio.

The Sonos Arc soundbar is equipped with up-firing and side-firing speakers for Dolby Atmos
Sonos said that the "multi-dimensional immersive sound experience is fast becoming a primary recording format among leading artists, producers and engineers", which is true, however, Sonos is a little late to the party.
Dolby Atmos music is already supported directly on speakers such as Amazon Echo and Apple HomePod, or on Atmos-compatible home theater systems via an HDMI-connected device such as Apple TV 4K, which already works with Sonos Arc and Beam.
- "It’s a thrilling time in music as spatial audio - and the artist creativity that comes with it - continues to grow," said Giles Martin, Grammy Award-winning producer, songwriter, and composer, and VP of Sound Experience at Sonos. "Sonos continues to put its listeners at the forefront of sound innovation, ensuring they have access through Apple Music to transformative experiences like spatial audio with Dolby Atmos, so they can feel more from the content they love."
Also read: First listen: Sony's ecosystem of 360 Spatial Sound products
Support for Apple Music's Dolby Atmos will be added via a free software update to the three Sonos products on March 28.