I Will Be Is A Song Written And Originally Recorded By Canadian Singer Avril Lavigne For Her Third Studio Album The Best Damn Thing 2007 . It Appeared On Select Editions Of The Album As A Bonus Track Before English Singer Leona Lewis Covered It For Her Debut Studio Album Spirit 2007 . Max Martin And Lukasz Gottwald Co-Wrote The Song Whilst Production Was Helmed By Gottwald Under His Production Name Dr. Luke. It Is A Piano And Guitar-Led Ballad. The Song Was Released As The Fourth And Final US Single From Spirit On January 6 2009 By J Records.