When it comes to legendary sounds in the history of rock and roll, few are more beautiful and fascinating than the first chord of the Beatles hit "A Hard Day's Night."

George Martin, the producer who recorded the track in April of 1964, has in the past explained that both he and the band knew the song would need a strong opening as it would open both the film 'A Hard Day's Night' and the soundtrack album.

Music scholars and Beatles fanatics have often debated the exact chord structure. For his Guitarology 101 series, Randy Bachman recently unveiled the complete structure of the chord. Bachman met with Giles Martin, George Martin's son and a record producer himself, who had access to all of the Beatles master recordings which had been converted to digital.

In the clip below, Bachman explains the breakdown of the chord including the individual parts played by George Harrison, Paul McCartney and John Lennon.