Bridget Kendall and guests explore the history of the guitar which stretches back over several thousand years. From early instruments made of tortoise shells the guitar emerged as one of the great cultural crossover instruments, encompassing folk traditions around the world, classical music and spine-tingling rock riffs. With guitar master John Williams, composer and guitar expert Professor Stephen Goss, Turkish guitarist Cenk Erdogan and French guitar maker Celine Camerlynck. (Photo: Boy with home made guitar. Credit: Daniel Hayduk/AFP/Getty Images)