MetaMC allows music submitters to categorize their Music by the use of keyword "tags" which can then be used for music searchers to easily find music on certain topics such as "mood" (e.g. chill, eat, love, dance, sport). Because of its support for user-generated tags (metadata), MetaMC can be considered an example for a folksonomy applied to collections of musical tracks.

The website provides both private and public music storage. A user uploading a piece of music can set privacy controls which determine who can listen to the music. Privacy settings for each track can be private, audible by friends/family or public. Privacy settings can also be decided by adding tracks from a users pool to a "group". If a group is private then all the members of that group can listen to the music. If a group is public then effectively the track becomes public also. A "contact list" is provided which can be used to control music access to a specific set of Users, in a way similar to that of LiveJournal.

Many of MetaMC's users allow their music to be listened by anyone, forming a large collaborative database of categorized musical works. By default, other users can leave comments about any track they have permission to listen, and in some cases can add to the list of tags associated with a track.

MetaMC offers Users (Creators) the ability to release their Music under certain common usage licenses. The licensing options include the Creative Commons attribution-based and other content-control licenses. As with "tags", the site allows easy searching of only those tracks that fall under a specific license.