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The music should have already been recorded and distributed by the copyright proprietor. Another method that is stated is that the copyright owner will get “first use” of their creation. Note that the copyright proprietor needs to be the one who recorded it; if another person steals their work and data it, that does not qualify as “beforehand recorded.” Also, recording it’s not sufficient. The copyright proprietor has to have made it out there for public consumption.
Except as expressly offered for herein, any copy or use of any portion of the Service shall constitute an act of copyright infringement and a breach of this Agreement. Furthermore, Musescore might in its sole discretion pursue some other obtainable rights or remedies at regulation or in fairness for a violation of this Agreement or such copyright infringement.