"Where or When" is a show tune from the 1937 Rodgers and Hart musical Babes In Arms. It was first performed by Ray Heatherton and Mitzi Green. That same year, Hal Kemp recorded a popular version. It also appeared in the movie of the same title two years later. Then, Dion and the Belmonts also released a successful remake of the song, and made it a number three hit on the Billboard Hot 100 in January, 1960.
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http://en.wikipedia.org/wiki/Where_or_When
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It seems we stood and talked like this before
We looked at each other in the same way then
But I can't remember where or when
The clothes you're wearing are the clothes you wore
The smile you are smiling you were smiling then
But I can't remember where or when

Some things that happened for the first time
Seem to be happening again
And so it seems that we have met before
And laughed before, and loved before
But who knows where or when

Some things that happened for the first time
Seem to be happening again
And so it seems that we have met before
And laughed before, and loved before
But who knows where or when
Who knows where or when