Music Tag is a MP3 & Audio software developed by Wide Angle Software Ltd. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Music Tag:

MarydownEditor: Music Tag is a powerful and easy to use program that automatically downloads missing track info and cover art to complete your music Library. Music Tag uses an advanced digital fingerprinting technology to accurately identify the tracks in your music library and proceeds to Download All the missing track info, such as Title, Artist, Album and Cover Art. The software can recognize over 35 Million individual Songs, and is incredibly accurate, identifying the correct song in every single test performed!
After using Music Tag, having "Untitled05" or "Unknown02" tracks showing up will be a thing of the past. Perfect for any Music Collection, this tool will not only allow you to fill in the blanks, but it also allows you to edit the track data inside your files, so you can personalize your data.
Music Tag is compatible with Windows Vista, Windows 7, and Windows 8, and it requires an active internet connection to download missing track data.
Music Tag is available as a free trial download, allowing you to download album art and track info for any number of music files. The trial will only save the music information to one of your music files per run of Music Tag. The full version of the software costs $14.99, giving access to all functionality, free customer support and a lifetime of free software updates.