1. Act like you own it.**
This singer had a great voice, he was just too nervous for his own good.
Shore up your confidence, settle your nerves and you WILL shine through, especially when you have the creative chops to back it up.
**This is different than "fake it 'til you make it". This singer had a great voice, he just didn't share his confidence with anyone. I'd assume you had a great book until you prove me otherwise.
2. Find something to do with your hands.
This singer could not figure out what to do with his hands. After a while, that was all I could pay attention to. He'd hold them stiffly at his sides, then hook his thumbs in his back pockets for a millisecond, then put them in his front pockets, then back out again.
Fidgeting gets you nowhere, just breathe and sit still. Sit on your fingertips if you have to.
3. Shut up.
Once this singer started chatting into the mic, his nerves took over and he didn't know how/when to wrap it up and get back to the music.
Nerves make all of us chatty and next thing we know we started a story about our portfolio and ended it talking about our cat. Again, take a breath and relax as much as you can. Answer the question you've been asked, then shut up.
4. Have fun.
My guess is this singer loves to sing. But combined with being very nervous, not knowing how to perform in front of an audience and squirming a lot, he just looked like he wasn't having much fun.
Advertising isn't rocket science. It is an industry where you can have lots of fun. Remind yourself of that as you head into an interview and feel yourself starting to get nervous.
Tell yourself: "This is fun. I am fun. This interview will be fun.
And I will own it."