Youtube is disabling or deleting unauthorized copyrighted tracks from videos. This move may effect a huge number of videos on the popular video sharing site. The videos with disabled audio are good for nothing, if the audio has been disabled for a video there is a message below the video that reads “This video contains an audio track that has not been authorized by all copyright holders. The audio has been disabled.”
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Youtube blog explains
Previously, when a music label or other rights owner issued a copyright claim to block audio, the video was automatically taken down. Uploaders had two choices: dispute the claim or use our AudioSwap tool to replace the track with one from our library of pre-cleared music. Now we’ve added an additional choice. Instead of automatically removing the video from YouTube, users can choose to leave the video muted and live on the site, and many of them are taking that option.
The user generated videos are the main attraction of the site and if they continue to do this users won’t be happy with it because the muted videos are no more useful. Most of the user generated videos are remixes, mashups and parodies and this may be the end of this mashups.

so theres no other way to fix that matter? theres no other way to get back the audio from the video?
this just happened to me. I’m extremely upset because I took the time to record, and upload it.
What’s the point of blocking a song people have heard many times? Really annoying.