BBC Radio 4 recent broadcast archived for a while at
http://www.bbc.co.uk/programmes/b011290d
"Nick Barraclough tells the story of the lead guitarist; from Chuck Berry and BB King's licks to Ritchie Blackmore and Jimi Hendrix's riffs. What's more, he reveals the difference between and riff and a lick.... We hear from Frank Zappa's 'stunt' guitarist and we hear of Ian Gillan's submission, and there is a discussion on whether the colour of a guitar's paint affects its tone and, a question that has been asked by lead guitarists since 1964 is answered: exactly what was that chord George Harrison played at the beginning of A Hard Day's Night?"
