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For the first few years, the HomePod exclusively supported Apple Music and AirPlay. It was not possible for third-party music apps to integrate with the device. In 2020, Apple did a HomePod Siri music API, and some services, such as Pandora, have adopted it.
Unfortunately, Spotify, the biggest music streaming service, has still not implemented this — in part because Apple and Spotify are embroiled in an EU legal battle over abuse of monopoly power. While you still can’t play Spotify natively from the HomePod, iOS 17 does streamline the experience significantly.
