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Opsound calls itself a "record label using an open source, copyleft model". Their website tries to facilitate open content music by indexing songs and aiding a community. They are similar to MP3.com, but they do not have advertisements. Opsound is more inclusive than Magnatune, and has no facilities for money transfers. Opsound does not host works, leaving that to others such as the Internet Archive's Netlabels. Metadata includes descriptions of songs and artists, track numbers, and indexed keywords associated with songs. All new songs must be licensed under the Creative Commons Attribution-ShareAlike 1.0 license, but a few songs are licensed under Attribution-NonCommercial-ShareAlike 1.0. Popularity charts were added around the end of 2003 and the beginning of 2004. Popular artists include _aa_, Binary Beats, and the Evolution Control Committee. There are plans to add software for so-called "microlabels" to allow people to create their own albums from the sound pool.