Sony Xperia devices for some time now have had their own version of an app for identifying songs by using the phone's mic to listen for playing audio, called TrackID. TrackID works pretty similar to the way that SoundHound, Shazam or Google's Sound Search do so users can find the names of artists and tracks that they hear on the radio or other mediums, and then provides users with a way to either buy that music or listen to it through other services. It holds a history of your past searches so you can go back and check on them at any time in case you forget a specific track name, and just a few months ago the beta version of the app started receiving Material Design through an update for some users.
As of today it appears Sony is officially rolling out that update for all Xperia device owners who have the TrackID beta application on their phones, which will usher in the new Material Design UI. The update also brings TrackID out of the beta stage and is turning it into a fully fledged app, it also is now available to numerous other device types as well so it isn't just limited to Sony Xperia phones and tablets. Users of TrackID can also use the app with wearables like Android Wear smartwatches and the Sony Smartband Talk, so they can easily and virtually hands free search for tracks and artists using the device on their wrist.
TrackID also synchronizes your search history and track listing content across multiple devices, which requires either a facebook login or a login with a Sony ID. Sony's TrackID is free and can be picked up and used by pretty much anyone using an Android device. It doesn't specify any Android version compatibility, although it does state compatibility varies with device, so chances are the app won't be compatible for some users. After you search for and track down a song that you like using TrackID, you can then further search for the song on YouTube or play the song on Spotify if you have the app installed and use the service, compared to Google's sound search app which identifies tracks for you but then instead redirects you to the Play Store to buy the songs.