The “Battle Rounds” continue, along with the input from the guest mentors brought on by this cycle’s judges. It’s a combination of good advice, genial competitiveness, and very talented vocal performances. It’s also a feel-good program which, on TV these days, is an increasing rarity. And last night’s closing Battle Round, with Hunter Plake and Jack Cassidy, featured two impressive singers with beautiful harmonies. And harmony was the emotional mood as well: They performed together generously, and professed to respect and like each other a lot, even as they competed to win this round of competition. What a relief to watch, and to hear – especially in these times.