As a special exception, if you create a composition which uses these sounds, and mix these sounds or unaltered portions of these sounds into the composition, these sounds do not by themselves cause the entire composition as a whole to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the composition might be covered by the GNU General Public License.
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Musical Artifacts is an open source web app helping musicians to find, share and preserve the artifacts they use for music production. It's worked on by volunteers in their free time.