The duet from "The Pearl Fishermen" or whatever it's from----surely that qualifies ?

The theme from "The Amorous Prawn" ( Denis Price "Ealing comedy")

       Jim Reeves " Whelk,come to my world !"
      
         "Clam Every Mountain"


The
infant sailor's nursery-rhyme " Winkle,Winkle,Little Tar "

"The Nautilass On Richmond Hill"

   The theme music from "Two Moules For Sister Sarah" (Clint & Shirley )