It was her brief marriage to Miles Davis that introduced the jazz icon to the music of Jimi Hendrix and Sly Stone.Betty Davis, the pioneering funk singer who released three albums of raw, gritty and sexually liberated music in the ’70s, has died at age 77, Rolling Stone has confirmed. Her chart presence was slight – she notched just two singles on the Hot R&B/Hip-Hop Songs chart, the No. 66-peaking 1973 single “If I’m In Luck I Might Get Picked Up” and the 1975 single “Shut Off the Lights,” which barely scraped by at No. 97. Even so, Davis’ impact...