Where does the expression "It's not over till the fat lady sings" comes from?

Question

I here this all the time so I am wondering the origins of this expression

Answer 1

Fat women usually sing the final songs in operas.

Answer 2

It comes from the "misconception" that during/towards the end of an opera, an aria is sung by a heavy-set woman dressed like a valkyrie...

Hence the expression, "It ain't over 'til the fat lady sings"

Answer 3

Same as the above.

Answer 4

Opera.

Answer 5

An opera often ends with an aria (in the past often sung by a hefty woman)

Answer 6

The opera ain't over till the fat lady sings. The outcome of any contest isn't known until the final results are in. Thus, don't make premature judgments or give up too soon. Often associated with Wagnerian opera, specifically Brunhilde's 'Fire Song,' in 'Die Walkure,' and the fact that Wagner may seem interminable to nonaficionados. Thus one's impatience would be relieved when 'the fat lady sings.' Originated in the United States in the 1970s. Bartlett's 'Familiar Quotations' attributes the coinage to San Antonio TV sports commentator Dan Cook. Ralph Graves claims in the August 1991 issue of 'Smithsonian' that it has its roots in Southern proverbial lore: 'Church ain't out till the fat lady sings. There are still other attributions, but nobody really knows who coined this popular saying."