Chirp for Windows Phone 8 is an unofficial Sonos controller! As the name suggests, this is the Windows Phone 8 version of the popular app, Chirp. It is no longer supported. Chirp has been rewritten as a Windows 10 universal app but the Windows Phone 8 version has been made available again for those not on Windows 10 Mobile and for those who miss some of the features that are not currently present in the new Windows 10 app. Note: if you are using this app on Windows 10 Mobile, you may find that your music library, Sonos favourites, etc. do not load.