What is the fine-grained topic of the following text: Jenckes, a fifth-season contestant on The Voice, channels that isolation — and his eventual transformation into a popular high-school football player — in his vulnerable new ballad, “Fat Kid.” Grammy-winning songwriter Lori McKenna sings harmony on the track, which she co-wrote with Jenckes’ former roommate Neil Mason of Southern-rock trio the Cadillac Three. Only return the topic.
Jenckes' new ballad "Fat Kid," co-written with Lori McKenna and Neil Mason.