Samsung had announced Spotify integration for the Galaxy Buds+ during the Unpacked 2020 press event last month. Now, it appears that the music streaming service's integration isn't just limited to the Galaxy Buds+ (read our review) earphones. The clock app on the Galaxy S20 series supports Spotify to be set as the alarm tone.
The clock app in One UI 2.1, which comes pre-installed on the Galaxy S20, Galaxy S20+, Galaxy S20 Ultra, and the Galaxy Z Flip, supports Spotify integration. This means that you can play your favorite songs as your alarm tone. You can find this option under the alarm sound section of the clock app's settings.
For this feature to work, you need to have Spotify installed on your Galaxy S20. If your country doesn't have access to Spotify, the feature won't work. If you have a phone that's running One UI 2.0, you won't have access to this feature.
Expect the feature to be rolled out to more Samsung phones as a part of the One UI 2.1 update. If you want a similar feature on your older Samsung device right now, you can install Google's free Clock app from the Play Store. Apart from Spotify, it also supports other music streaming services such as Pandora and YouTube Music.