This Friday night, Allie Hughes has a concert at the El Mocambo. You might not have heard of this homegrown singer-songwriter yet, but maybe you will sometime soon. Hughes has a dynamite voice that she can effortlessly shift from a gentle coo to an operatic cry while she sits at her keyboard, presiding over her rockin' little band. Her songs bridge an adorable gap between sassy and poignant, and the general vibe is along......