Yes, if a telephone is connected via Bluetooth to Horizon, this is possible. When adjusting the wake-up timer, there will be an option to select various wake-up tones, or Bluetooth sound. Select Bluetooth as source, while the telephone is playing the music stored locally, or streaming what you want as wake-up music. When the wake-up adjustment is finished, music will be playing over Bluetooth through the Horizon. Press Pause on the source telephone, or press the round selector button (between the two arrow-buttons) on the Horizon to pause the music. Now the system is ready to wake you up with Bluetooth music. When wake-up time arrives, Horizon sends a Play command to the telephone, and music plays via Bluetooth. You can use music that is stored in the phone, use Spotify or play from the cloud. This has been tested with both iPhone 6 and Samsung S6, and should work flawlessly.