Fedora? Check. Guitar and ukulele? Check. Optimism that can illuminate a dark and pessimistic world? Quadruple check. Six albums in, and Grammy-winning singer-songwriter Jason Mraz remains one of the few glass-half-full artists left. His outlook on love and life, paired with easy-breezy folk-pop, invigorates Know. like a gust of fresh ocean air. Expect sunset serenades (“Love Is Still the Answer,” “Better With You”), rappy moments (“Unlonely,” “Have It All”), even cheeky country (“Might As Well Dance”). His time on the Broadway stage playing Dr. Pomatter in Waitress hasn’t affected his vocal projection; Know. shows Mraz as the lovable, relatable troubadour he’s always been.