Keith Konrad Slettedahl (born August 9, 1973) is an American musician. He is the singer and songwriter for Los Angeles pop rock group The 88. In 2006, he appeared in the episode "Best Prom Ever" on the sitcom "How I Met Your Mother", playing a gig with his band on a High School-Prom. Using only the above description and what you know about the world, "Keith Konrad Slettedahl will sing the National Anthem in the World Series. " is definitely correct, incorrect, or inconclusive? 