The story about Paul Simon's song, on the other hand, is that the composer Pierre Boulez (or possibly Hector Berlioz) came to dinner with Paul Simon and his wife Karen (or possibly Carol). They hit it off and had a very nice evening, and as he left Boulez (or Berlioz) said "Thanks for inviting me, Al - and tell Betty it was a lovely meal." Hence "I can call you Betty, and Betty, when you call me you can call me Al".