These people have actually stood up ... and that has to be saluted.The Rock and Roll Hall of Famer said he is impressed with rappers such as J. Cole, who released a heartaching, tearful song called Be Free inspired by Brown, the unarmed 18-year-old who was shot to death by a Ferguson officer on Aug. 9.Others in rap also have lifted their voices: Talib Kweli, like J. Cole, marched in Ferguson an