I'm not an expert. I just tried some of the tabs that were there, and my ear said they weren't quite right. So I tried similar chords in the places that others had written their chords - Dan Hogan taught me a little about progressions, and how sevenths fit in, and I've learned a little online and in books. So, I found a progression that made sense to me. The internet helped me name my chords, and I submitted my creation. One day turn-around again.
Sarah McLachlan - Angel - tabs