Thanks for the video. I, too, have always wanted to see Vienna's Letterman performance. It certainly was a milestone achievement for her to be on Letterman and I'm glad it helped spread word about her talent.
She sounds kind of nervous in this performance, though, heh! Understandably. She also wavers off-tune a bit, which surprised me. But again, that's understandable, as it was broadcast to millions of viewers.
Still, her voice is nice and velvety. I also love how she's smiling. It looks like she's trying to edge off the nerves and enjoy herself. Letterman should invite Vienna back for her 4th album release because, like a fine bottle of wine, Vienna only proves to get better and better every year!