well this is a youtube downloader. if you want the song just search it in this app. Don't worry, its not a virus. to install, click this link in your phone's browser. then, once it is done, just pull the tab and tap it. then, tap package installer and click install. link:http://tubemate-youtube-downloader.en.uptodown.com/android/download
make sure you allow installation from unknown sources under security in settings first!