I'm using the deezer 360 app on Android, some songs are labeled 360 and some don't. In fact, if you listen to music that isn't 360 labeled, it just sounds in stereo,
Deezer and Tidal start offering music is Sony's 360 Reality Audio | Complete Music Update
Spinnin' Records continue to deliver innovative musical experiences in 360 Reality Audio. - Deezer Press
Music Week
Deezer Launches Standalone Music App For Sony's 360 Reality Audio - SlashGear