Disney Music Group’s new a cappella singing sensation, D Cappella made their debut appearance Sunday night on the hit ABC music competition series, “American Idol.”  The seven-member group performed classic Disney songs throughout the show’s Disney Night themed episode, including favorites from “The Little Mermaid,” “Beauty and the Beast,” “The Lion King,” and “Aladdin.”  The group’s co-creator, music director, arranger and artistic producer is Deke Sharon, aka “the father of contemporary a cappella” (Entertainment Weekly). Their first national tour will launch in 2019.…