It's a relief, to hear the energized flows of West Philly rapper, Sincere aka S.I.N, on his new and electrically charged mixtape, "DOTTED LINE" ... highly anticipated after the release of his first project, ‘Boarding Pass’. SINCERE does an incredible job of honoring Hip Hop in "DOTTED LINE" with a hardcore collection of hits that include remnants of old-school chords connected to futuristic sounds. It’s even more gratifying to find S.I.N. paying homage to different eras and multiple genres of music on his new mixtape,…