Big Sean performs at The Masonic in San Francisco on March 23, 2017. Photos: Jose Saucedo. SAN FRANCISCO — There’s a common misconception that sex, drugs and partying are primary themes in rap music. Big Sean proved otherwise at The Masonic Thursday. The Detroit rapper known for opening up about…

Since getting signed to Kanye West’s GOOD Music label, Big Sean has had every opportunity to establish himself as one of hip-hop’s elite. Despite this, he has always seemed to be a step behind those at the top, never establishing a distinct identity for himself. Sean aims to end…