They played her cover of a Garbage song once, but that's it. I love Kat, but I blocked out which song -- it's one of my fave Garbage songs -- because I didn't know it was her so I felt a little bad after I found out because when I heard it in the background, I was like WHAT HOLY FRESH HELL OF A COVER IS THIS?!?!! Her original music really doesn't fit TVD's atmosphere, though, so they've never played anything else she's done.