You don’t need to be a great musician like Steven Van Zandt, Bruce Springsteen or Paul Shaffer to understand the greatness of Darlene Love. Perhaps they understand it on a more musical level, but anyone who has ever heard that amazing voice gets it. Her songs radiate joy, none more so than the classic of this season, “Christmas (Baby Please Come Home).” Darlene’s musical journey has included glorious heights, stressful lows and one of the longest and most satisfying second acts in American musical history.