NASHVILLE (AP) — The hardest song for Thomas Rhett to sing live is his new single, “Crash and Burn.” Rhett says he sings the lowest he can on the verses and the highest he can on the chorus. He says if he had made the verses higher or the chorus lower, he wouldn’t have been able to sing the other one. “Crash and Burn” was a risky song for him in another way. When he was making his “Tangled Up” album, he sent that song and a few others to be tested by a focus group and the group hated all of them.