MusicBrainz is described as 'Community music metadatabase that attempts to create a comprehensive music information site. You can use the MusicBrainz data either by browsing this web site, or you can access the data from a client program — for example, a CD player program can use' and is a very popular Music Discovery service in the audio & music category. There are more than 10 alternatives to MusicBrainz for a variety of platforms, including Web-based, iPhone, Android, iPad and Mac apps. The best MusicBrainz alternative is Discogs, which is free. Other great apps like MusicBrainz are ratehouse, Rate Your Music, Gracenote and AllMusic.