Apple is rather proud of Siri’s voice revamp in macOS High Sierra. Although the virtual assistant hasn’t quite clambered out of the uncanny valley, Siri now sounds more natural and expressive
In High Sierra, Siri’s designs on being your personal DJ go up another notch. Already, you could ask it to “play some music” or to start playing something by a specific artist. Now it can respond to moods and make recommendations, provided that you have subscribed to Apple Music. (If not, Siri curtly notes “I can’t play music for a particular mood.”)
Siri has one other trick in macOS High Sierra: In System Preferences’ Accessibility pane, select Siri (under the Interaction heading on the left), and put a check mark next to “Enable Type to Siri.” Although this is primarily intended for people who can’t speak to Siri, it’s handy if you need to ask the assistant something, have headphones on, and are somewhere it’s best to be quiet. You can also have Siri respond without talking to you by turning off voice feedback in its pane within System Preferences.