To further exemplify the fact that Mimi doesn't like doing TV performances:

I definitely still get nervous before I go on stage, really more for TV stuff because it's live and you can't control it, it's not the same energy as being on stage on tour. That's why I prefer doing live performances for fans rather than TV shows and stuff which are cool to do but it's not the same because when you're just singing there for your fans and it's live and it's in the moment, there's nothing like it. You can just riff however you want, especially as a songwriter, it's good for me to be able to sing a song I've done it feels like a million times before, but I can do it differently everytime 'cause I wrote it.

The bottom line is that Mariah is a GREEEEEAAAATTTTT singer, but that no matter how long you are in the biz you'll always have butterflies (literally and figuratively) in the pit of your stomach. I chock any lack of vocal prowess during TV appearances to both NONSTOP touring and nerves. She's an artist before anything and her song writing and voice are amazing.