Spotify is finally getting Siri support. You’ll be able to request songs, albums, and playlists through Siri to play on Spotify. It won’t work through an Apple Watch, but it does work on iPhones running iOS 13.1 and even Apple’s AirPods headphones.
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How to Get Siri to Play Spotify - Siri User Guide
You will soon be able to ask Siri to play Spotify music on iOS 13, feature currently in beta - 9to5Mac
Long-awaited Spotify-Siri Integration Now Available to All Users
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