What drives musical creativity? HARDtalk’s Stephen Sackur speaks to songwriter Mark Knopfler. In the pantheon of rock ’n’ roll greats, a special place is reserved for guitar virtuosos – think Eric Clapton, Jimmy Page or Mark Knopfler, front man of Dire Straits, one of the biggest bands in the world in the 80s and 90s. Unlike so many other rock stars, Knopfler never fully embraced the world of excess and celebrity. He forged a solo career writing, performing and working with the likes of Bob Dylan, Tina Turner and Emmylou Harris.Image: Mark Knopfler (Credit: BBC)