How do you not get copyrighted on YouTube?

want upload video song in backround , uploaded took sound off because said copyrighted. wondering how can not copyrighted? have audacity , wondering if changed tempo still take down or mute sound? give me other ideas not copyright! thank much<3

i want upload video song in backround , uploaded took sound off because said copyrighted. wondering how can not copyrighted? have audacity , wondering if changed tempo still take down or mute sound? give me other...

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