macOS Sierra includes Siri, bringing voice-activated assistant to the Mac for the first time. You can search for files and folders, as well as the typical queries you would expect from Siri.
Whilst multitasking in other applications, you could also use Siri to activate music.
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File icons also appear live in Siri which can be dragged and dropped into the document. Siri appears as a small translucent window in the corner of the screen, not a full-screen modal like on iOS.