When David Crosby takes the stage at the Fillmore Miami Beach Tuesday night, he’ll be alone, accompanied only by his guitar, his songs and his ability to spin a tale.”It’s how I started out,” Crosby says, describing the challenging intimacy of his solo acoustic tour, in support of the excellent 2014 album “Croz.” “I like the tale-teller, troubadour essence of it, when words really count. When it’s just one guy and one guitar, you can really take people on the voyage.”