Luciana Souza has one wish for humanity in a troubled time: “That we all can make a difference in every way that we live.” Souza is a singer-songwriter originally from São Paolo, Brazil, and her words carry a certain tragic resonance as the world watches the Amazon rainforest burn. But she spoke those sobering words last March, on The Checkout Live at Berklee College of Music, right before paying homage to her country’s all-time greatest songwriter, Antonio Carlos Jobim.