So the audio got muted on a video of mine on youtube

This video previously contained a copyrighted audio track. Due to a claim by a copyright holder, the audio track has been muted.

###Your video has been muted.
Copyrighted content was found in your video. Your video is still playable on YouTube. However, because of the claimant's policy, your video has been muted.

The only thing is, the video wasn't some track from a movie soundtrack, it was a recording of me playing a Star Wars Medley as a member of my high school orchestra. I see the button to dispute the claim, but before I do that I need to know, does the fact that I'm the performer of the music change anything (as opposed to the video being just a track from the official soundtrack)? I read up on the subject but nothing I found addressed whether cover songs are permissible and such. Basically, can I dispute the claim on the basis that it's my performance (like a cover version)?

On which SE can I ask this question?