Hi, pquinlan. The four sets of letters are the real initials of four people who died in the same 'plane crash - Richie Valens, Buddy Holly, The Big Bopper and R A Peterson (the pilot). I wasn't among the 2 per cent who got it right!
Hi, crick118. Hope the info was useful to your friend. Even if it was too late for the quiz, an acknowledgement would be appreciated. Thanks.