I don't think that can be it, because of the second verse,
For if I ever saw you
I didn’t catch your name.
But it never really mattered
I will always feel the same.
That says that he hasn't met her yet. And the last verse too,
And when at last I find you
Your song will fill the air
Sing it so loud I can hear you
I think it might be about looking for love, and imagining the person that you're going to find and fall in love with.
I don't think that can be it, because of the second verse, For if I ever saw you I didn’t catch your name. But it never really mattered I will always feel the same. That says that he hasn't met her yet. And the last verse too, And when at last I find you Your song will fill the air Sing it so loud I can hear you I think it might be about looking for love, and imagining the person that you're going to find and fall in love with.