first piano/singing cover- miserable at best by mayday parade. need opinion

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Well, I just finished recording my first piano/ voice cover. It's posted on youtube at http://www.youtube.com/watch?v=vfqUgoqaGuw . I really don't know how I truly sound and would appreciate some opinions or feedback. I know it's not perfect, messed up once or twice. But anyway, some feedback would be great (and please be 100% honest). Thanks!