Co-president David Solomon likes to spin sick beats
                                
                                
                                    (Newser) -
                                    One of Goldman Sachs' co-presidents, a part-time DJ, is set for promotion, while the other, a karate black belt, is packing his bags. Harvey Schwartz, appointed co-president when Gary Cohn left for the White House in December 2016, will leave the firm after its board of directors chose fellow co-president...