The records that changed the way I heard music are all from the 1950s when I was a teenager. There are four of them:
1. Bill Haley & His Comets, "See You Later Alligator" (78rpm)
Heard at the age of 16 in 1956, this swept me into the British rock 'n roll craze.
2. Claude Luter's Band with Sidney Bechet, "Les Oignons", "Le Marchand de Poissons", etc (45rpm EP)
The following year an older schoolmate (who was all of 18!) advised me not to waste my time with rock and roll and lent me this. This led to a year's listening to traditional jazz, from contemporary Brits like Humphrey Lyttelton to Morton and Armstrong in the 20s.
3 and 4. Miles Davis Blows ("Bag's Groove" and "Swing Spring" with Milt Jackson and Monk) (10" LP Esquire) and Bird and Diz (1950 with Monk) (EP)
One year later at the age of 18 in 1958 a friend bought these. These created a taste which has dominated my listening ever since and I always say that I remain a bebopper at heart, despite a passing interest in modern classical music and the expansion of my jazz tastes to include cool, big band and mainstream. Rock completely passed me by. When The Beatles emerged in 1964, I was 24 and into the new sounds coming from Blue Note records and Coltrane.