The song Wake Up Your Heart, the second ending of the anime Yu-Gi-Oh! GX, sang by KENN with The NaBs. Contains English translation subtitles of the lyrics. KENN is also the voice actor of the protagonist Yuki Judai.

Source of image: http://www.pixiv.net/member_illust.ph...
Translation thanks to: http://atashi.wordpress.com/2006/09/2...

Note: For the third line, "Let's believe in the future more than the past and live in the future", that's translated from the written lyrics, but the line was sang as "Let's believe in tomorrow more than yesterday and live in today". ^^