Earlier this month, Google released an app to the Play Store simply called "Sounds." The app didn't do anything at the time, but it appeared to be the Pixel sound settings getting spun out into its own app. Think of it sorta like the Google Wallpapers app. Now the Sounds app has been updated with a brand new UI and it's working on Pixel devices.
Unlike Google Wallpapers, the Sounds "app" is really just the ringtone settings on Pixel phones. It doesn't work on other devices and there is no launcher shortcut. You can access it on a Pixel device by going to Settings > Sound > Phone ringtone. The ringtones are categorized as My Sounds, Pixel Sounds, Classical Harmonies, Minimal Melodies, Reality Bytes, and Retro Riffs. The new UI and organization make it much easier to choose a ringtone.
This isn't a terribly exciting app (especially if you exclusively keep your phone on vibrate like me), but it shows Google is continuing to bring parts of Android out into the Play Store. This allows them to update small chunks of the OS without a full system update. The Play Store listing shows the app is compatible with some non-Pixel phones, but in our testing, it does not work on them. If you own a Pixel, you can download the APK right here (app may not display correctly in Play Store widget below).
[appbox googleplay com.google.android.soundpicker&hl=en&gl=us]