John William "Buck" Wilkin was an American singer-songwriter and session musician. Wilkin started his career as a child on the Ozark Jubilee television program with Brenda Lee. His mother, songwriter Marijohn Wilkin, later moved the family to Nashville, Tennessee, where she started the publishing company Buckhorn Music. Wilkin and Buckhorn Music had a hit in 1964 with his original composition "GTO", which he recorded as a member of Ronny & the Daytonas and was frequently covered by groups such as the Beach Boys and the Hondells.