100 Word Challenge for Grown Ups – Week#46

Why is it? When I need to remember the Sanskrit alphabet; verbs or nouns,  even those I have revised every night for months.  Or various conjugations and paradigms learned like parrot each day for a year.  When researching the subtle differences between feminine, masculine and neuter.  Or I wish to learn the meaning of a particular word, only yesterday I added to my vocabulary list. I have to delve into the dark recess of my mind.
Yet when I hear two bars from a pop song played on the radio in 1959 I can remember every note, word and the position it held in the top twenty.