To great applause, John Mellencamp took the Rock and Roll Hall of Fame stage to introduce attorney Allen Grubman and used the opportunity to decry antisemitism and implore his fellow artists “to speak out against all forms bigotry and hatred.” Grubman, Mellencamp’s longtime attorney, was inducted in the Hall of Fame with the Ahmet Ertegun award, recognizing his decades of work in the music business. Mellencamp has been a client since 1982. Mellencamp described himself as a “gentile” who took to heart the hateful rhetoric being directed at Jewish people in the wake of remarks make by Kanye West, who...