yea what freezy said, You will prollie play the song from a mobile phone/speakers w.e so you can say it along so it flows (what you are saying matches the song).
Then the editor will cut and paste different angles of you rapping to the song and he'll mute all video sounds and paste the track over it.
If you open movie maker you'll see that under videos you have space for a track. If you mute the videos and post the track then you'll hear the song playing on the video
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