Alex Cuba is a Grammy-winning artist known for his joyful, genre-blending sound. But on his new album, “índole,” he taps into sorrow as a creative force. His songs also reflect his Afro-Latin roots, and he wrote his 11th studio album as a thank you to his ancestors and the African diaspora that gave Latin music its heartbeat. He joins Tom Power to talk about finding beauty in pain, gratitude in his ancestors, and the true nature of where his music comes from.