Diversity is this DJ’s strongest suit. Bluhm is a gently subversive pied piper whose deft mixing and genre-spanning library moves the masses while simultaneously satisfying in-the-know music nerds. He’ll people-please at festivals, like spring’s Taste of Somerville, then energize niche crowds at his LGBT-oriented regular gigs: poppish Thursdays at Club Cafe, hip-hop-skewing Saturdays at Machine and, on three out of four Fridays, eclectic era-jumping electronica at the Alley Bar.