In the early 1970s other Southern rock groups emerged, influenced by the British rock and hard rock guitar sound: notably, the sound of Keith Richards of the Rolling Stones, exemplified by his riff on "Brown Sugar," and Free guitarist Paul Kossoff's guitar play on "All Right Now". The harder rocking Southern groups' music emphasized boogie rhythms and fast guitar leads with lyrics extolling the values, aspirations – and excesses – of Southern working-class young adults, like the outlaw country movement. Lynyrd Skynyrd of Jacksonville, Florida dominated this genre until the deaths of lead singer Ronnie Van Zant and two other members of the group in a 1977 airplane crash. After this tragic plane crash, members Allen Collins and Gary Rossington started the Rossington Collins Band. Bloodrock combined Southern rock, hard rock, heavy metal and psychedelic rock.