How do you add music to a video?

Ok so I want to add some music to my youtube video. How do I add an actual song instead of the generic stuff the computer already has. I usually add my own stuff from my itunes...which works...but my main question is what happens if I don't have the...

I'm just learning how to use my flip video and I have a few questions about it. 1) How do you add music from itunes to the videos -I click "upload your own music" but when I get into the files it will not let me download the music from itunes...

I have a HD Go Pro camera and I took a video with it, and I want to add music to the video. Now I obviously know of some programs but they ruin the video quality once the the videos is done processing. Does anyone know of a program where I can add Music...

I found this hockey video on youtube, its someone elses i did not post it, and i want to somehow upload the video and add music to it. is it possible to make a video with the same video and then add music to it? please help!

I am trying to edit a movie in windows movie player and delete the audio from the actual video and just add music to it. The audio from the video is overpowering the music. Thank you

I have the blank video (AKA a video with no sound) and I have the music, but i'm not sure how to add the music atop the video. Help?

i want to add music to a video i recorded so i wanted to know how could i add music

me & my friends have to do this spanish project, & we have to video tape us cooking a spanish meal & once we get it onto the computer, how do we edit it & add music & graphics and stuff to it? please help!