MathematicalArtist's cover of Bridge to Terabithia 2007 song

I recently began rereading a fan fiction story on "Bridge to Terabithia" when I remembered about a video I used to watch on YouTube back in 2009 which has since disappeared.

The video is an instrumental cover of "Keep Your Mind Wide Open", a song from the 2007 film adaptation, uploaded by a user named MathematicalArtist. The cover was classical music-sounding, or at least had violins. The video used an uncropped version of this picture.

Inputting the URL of the uploader's channel leads to the error "This channel does not exist." 

I hope to see the video again.