Mark, some times melodies don't remain. They are there while someone is singing a song, and I can sing along with them, but try to recall the tune later is almost impossible.

I know I like it, but darn if I can recall it.

No, the best way is to play a tune/sing a song OVER and OVER and OVER and OVER.

Remember how we learned the multiplication tables? Or are some of you young enough you had calculators the whole way through school?