"Must have" in English use for saying past probability.?

White Bell

New member
"Must have" in English use for saying past probability. Is there any future use of "Must have" in English.

I went through a sentence now a days like one saying regarding about a song.
"It should be melodious and must have a story to tell".

For the above sentence 'must have' used for compulsory. Isn't it? Please inform me the usage of "Must Have".
 
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