In an age where musical mimicry abounds, The Gillum Bros have chosen to pursue a style completely their own. Originally from Detroit, Michigan, the Florida-based brother duo combines witty chord progressions, powerful vocal melodies, and syncopated grooves to form a fresh, alternative sound.     “I started drumming when I was 8 years old,” says younger brother Ryan, the duo’s main songwriter and instrumentalist. “After being fed up with the sound of pencils ...