The Shure Unidyne 55 microphone has been a favourite of musicians and public speakers since 1939 – from Elvis Presley to Metallica, and from John F. Kennedy to Martin Luther King.

Tuesday marked the 66th anniversary of the tragic plane crash that took the lives of early rock 'n' roll stars Buddy Holly, Ritchie Valens and The Big Bopper (J.P. Richardson). And to commemorate what ...