How do you change your voice on your youtube videos?

ok there are ways that i herd of how you do it (but i never did it) you have to change it a little like skip a part of the song like a line or 2 and change name of the song like 4 example lady gaga's song love gameS people change it to love game without an s or when you upload it it might say add a sound or song and you buy the song and add it to the video but like that you have to buy it (iv never dun it so i dnt know if you could)
I've seen a lot of videos that put on the side info: I DONT OWN THE SONG just the pictures, or making a statement who the song belongs to and that no copyright infringement is intended.

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I have a channel on youtube. It states that all the music and videos belongs to the owners and my videos are translations for educational purposes, which they are in my case at least.
I haven't been muted yet, but you never know one of these days I could be next.
The answer is simple: Get permission from the copyright holder to use their music. After that, you can use it with no problems.
Just because other people do it, doesn't make it right. You agreed to NOT upload copyrighted materials when you signed up with YouTube. With every upload, you vow that you are uploading only stuff that you have a legal right to use.

The former can rip IFO, DVD to PSP MP4 video and MP3 audio files.

"By clicking "Upload Video", you are representing that this video does not violate YouTube's Terms of Use and that you own all copyrights in this video or have authorization to upload it."
So you lied in both cases!
You deserve to be muted... you broke the rules.
Jury rules against Minn. woman in download case
AP By STEVE KARNOWSKI, Associated Press Writer Steve Karnowski, Associated Press Writer

The excellent DVD to Apple TV software also enables you to custom file size.

A replay of the nation's only file-sharing case to go to trial has ended with the same result a Minnesota woman was found to have violated music copyrights and must pay huge damages to the recording industry.
A federal jury ruled Thursday that Jammie Thomas-Rasset willfully violated the copyrights on 24 songs, and awarded recording companies $1.92 million, or $80,000 per song.
Thomas-Rasset's second trial actually turned out worse for her. When a different federal jury heard her case in 2007, it hit Thomas-Rasset with a $222,000 judgment.