Lyric discussion by ice-9 

Cover art for When Mac Was Swimming lyrics by Innocence Mission, The

Um...okay, but what is it about? Even the guy that knows Don didn't find out...?

It sounds to me like a song to/about a child, celebrating a birthday. The parent is running around trying to get the birthday party in order, and the child is just enjoying life in in the way only a child does, nearly oblivious to how much he means to the people that care for him.

It was a great surprise to him so many people came. Nobody knows, darling. Nobody knows how they are loved.

Wonderful and sweet. If my daughter ever gets married, this will be our dance, if I have a say.

@ice-9 I agree, it seems like a child's birthday celebration, "nobody knows how they're loved" - the child doesn't know, because he/she is a child but this is also a nod to all of us adults - we never know how we're loved. And then the line, "the flowers that grew, the things that happened" - adult things in their lives that didn't impinge on the childhood of the kid, or something like that.

And the last line, it's a hopeful - wistful maybe - but a hopeful, positive, bright future is ahead.