David Cook: Big Heart, Big Talent

When Idol contestant Luke Menard had been diagnosed with Hodgkin's Lymphoma, that David took the time out to visit his friend in the hospital.

David Cook is not your ordinary one-hit-wonder.

David's brother Adam has been fighting brain cancer, and David Cook says that cancer is the big part of his life.

American Idol star dedicated all of his performances to his big bro, proudly displaying his initials on his clothing and guitars during the show.

When Idol contestant Luke Menard had been diagnosed with Stage Two Hodgkin's Lymphoma, that David took the time out to visit his friend in the hospital.

“I love Luke and I just wanted to show up and make sure that he understood that I love him and know that if there’s anything I can do for him and his wife, sign me up, you know?” David told People.com.

“Luke, Michael Johns, Jason Yeager and myself, we kind of buddy-ed up one day at Hollywood week,” he explained of their bond.

“We called ourselves the four horsemen. Any time one of your own is going through something as horrible as that, it makes everything else seem a little bit insignificant."

David vows to use his new found fame to hopefully make a difference -- and that's just another reason to love this star-in-the-making.

"Cancer is a very big part of my existence," he said “I’m excited to be put in [the spotlight] where I can hopefully do something to help other people.”