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I noticed that on youtube some people add background music to their videos. What program do they use to do this? Is it something that youtube provides?

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avi tag is inappropriate. Not all youtube videos are AVI, and AVI isn't the only format that supports sound. – rlb.usa Jul 8 '10 at 19:55
up vote 2 down vote accepted

Yes, you can now use, or simply use video editors for your OS (like Windows Movie Maker or iMovie).

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