CMT announced an additional round of artists scheduled to perform at the CMT Awards on June 5: Boyz II Men, Brandi Carlile, Brett Young, Keith Urban, Little Big Town, Luke Combs, Sheryl Crow, Tanya Tucker, Trombone Shorty and Zac Brown Band. Previously announced performers include Carrie Underwood, Dan + Shay, Kane Brown, Kelsea Ballerini, Luke…