who sang

[redlyon]

it could have been me

[Mortartube]

If you mean "It should have been me" it was Yvonne Fair

[samuel23]

Yvonne Fair---It Should Have Been Me
top ten single in march 1976
Also can be found on the Bridget Jones's diary 2 soundtrack

I saw my love walking down the aisle
& as he passed me by, he turned & he smiled
The preacher joined their hands
& all the people began to stand
When I shouted:

"You know that should have been me
Instead of her walking with you
You know that it should have been me
Getting ready to marry you
Darling, darling
You made a promise that we'd never part
& then you turned around & broke my heart
Now you're standing there saying 'I do'
Holding hands with somebody new
It should have been me
Instead of her standing by you
You know that it should have been me
Getting ready to say 'I do'!"

Then the preacher asked, "Will there be silence, please?
If any objections to this wedding
Speak now or forever, forever hold your peace"
Then I shouted:

"It should have been me
You know that it should have been me
You know that it should have been me
Darling, how could you do this to me?
People let me tell you now
It should have been me
Instead of her standing by you
You know that it should have been me
I've always been faithful & true!"
..& fade