You can listen to any track on repeat. Simply go to the player on the bottom of your screen and click on the arrow icon:
Clicking on the icon and turning it orange will activate ‘repeat’. The song will repeat until you uncheck the icon. You can also press ‘SHIFT + L’ on your computer’s keyboard to turn the repeat button on.
On the Android app, you can repeat tracks and playlists via the Next Up feature.
On iOS, the repeat feature is only available for individual tracks via the Next Up queue: