If you can't find All I Ask by Bruno Mars on Spotify it's possible this track isn't currently available in your region.
Spotify works hard to constantly add music to its content database, but availability can vary over time and between countries, depending on agreements between Spotify and rights holders, such as artists or record labels.
We add new content to Spotify every day, so if you can’t find the song right now, it may appear soon. Alternatively, you can always contact the artist or record label with your query as well.
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“Music is the wine that fills the cup of silence.” - Robert Fripp