The recently launched Samsung Galaxy S20 has a feature to set songs from Spotify as music alarm sound. The same feature has also been available on any Android phone with the Google Clock app. You can connect your favorite music app to your Clock app and select any song from these services as music alarm.
How to Set Spotify/YouTube Music songs as alarm on any phone
[Note that Spotify will ask you to grant permission to connect to the Clock app. YouTube Music requires premium subscription to set music alarm] Samsung Galaxy smartphone users note that currently, this feature is available on Galaxy S20, S20 Plus, and S20 Ultra only. The OEM may bring the feature to older devices via a future software update.
Set Music alarm on Samsung Galaxy S20/Galaxy S10
You can also search for any song or playlist using the search option. Tap on the search icon, select your favorite song for your alarm sound. Update: The latest Samsung Clock app (v11.0.00.32) has added the feature for older Galaxy phones, such as Galaxy S10 running on OneUI 2.0 (Android 10). You can download the latest version of the app from Galaxy App store [Link]. Note that this feature may not be available in evry region.
More on Spotify and YouTube Music:
How to add Spotify and YouTube Music to Google MapsTurn on sleep timer on your music player appHow to view lyrics on YouTube Music for AndroidControl music from Galaxy S7 Edge Screen with Music Edge Panel