Keith Urban's performance of the tender song "Burden" was an emotional highlight of the ACM Awards telecast. The tune, which Urban says stopped him cold when he first heard it, was penned by Primary Wave tunesmith Foy Vance. The gifted singer/songwriter has co-penned six compositions for Ed Sheeran (and is inked to Sheeran's Gingerbread Man imprint); he's also contributed to songs recorded by Miranda Lambert, Kacey Musgraves, Rudimental and Rag 'N Bone Man, among others. We're told that he has several new songs rolled up in that mustache.