There's a lot of sincerity and passion in the lyrics of Mario Domm, the sly but empathetic frontman of Mexican pop-rock balladeers Camila. His gift made him one of the most in-demand songwriters of Latin pop; his words reveal tender vulnerability in Alejandra Guzmán's “Volverte a Amar,” deep yearning in Romeo Santos' “Rival,” and burning heartache in Kalimba's “Tocando Fondo.”