Although the only widely successful examples of mass collaboration thus far evaluated exist in the textual medium, there is no immediate reason why this form of collective action couldn't work in other creative media. It could be argued that some projects within the open source software movement provide examples of mass collaboration outside of the traditional written language (see below), however, the code collaboratively created still exists as a language utilizing a textual medium. Music is also a possible site for mass collaboration, for instance on live performance recordings where audience members' voices have become part of the standard version of a song. Most "anonymous" folk songs and "traditional" tunes are also arguably sites of long term mass collaboration.