Marlena Shaw, the jazz and R&B vocalist whose “California Soul” was one of the defining soul songs of the late 1960s, has died aged 81. Shaw’s daughter, Marla Bradshaw, announced the singer’s death on Friday in a video posted on Facebook. “It’s with a very heavy heart for myself and my family I announce that our beloved mother, your beloved icon and artist Marlena Shaw has passed away today at 12:03,” Bradshaw said in the video. “She went very peacefully, and she went listening to some of her favourite songs.” From 2Pac to Biggie: These are the greatest songs that sample Bobby Caldwell’s soulf…