Three new groups bring style, sass, and emotion to the quest for the finale. The men of Berklee’s CharlieChords bring their bright red ties and charm, the women of Danvers High School’s Ingrid Sound deliver a heartwarming rendition of “Unconditionally” by Katy Perry, and Oure Pleasure Singers share their love of song with a version of Ron Jeffers’ “I Have Had Singing.”