Will Happen, Happening, Happened - Rebecca Sugar

Time is an illusion that helps things make sense
So we are always living in the present tense
It seems unforgiving when a good thing ends
But you and I will always be back then
You and I will always be back then
You and I will always be back then
You and I will always be back then

Singing: Will happen, happening, happened
Will happen, happening, happened
And will happen again and again
Cause you and I will always be back then
You and I will always be back then
Will happen, happening, happened
Will happen, happening, happened
And we'll happen again and again
'Cause you and I will always be back then

If there was some amazing force outside of time
  to take us back to where we were
And hang each moment up like pictures on the wall
Inside a billion tiny frames so we can see it
  all, all, all

It would look like, will happen, happening, happened
Will happen, happening happened
And there we are again and again
'Cause you and I will always be back then
You and I will always be back then
Will happen, happening, happened
Will happen, happening, happened
And there we are again and again
'Cause you and I will always be back then
You and I will always be back then
You and I will always be back then
You and I will always be back then
That's why
You and I will always be best friends

I know rationally that Adventure Time is over. I saw it coming, and heard it rumored, and heard the wails of anguish over it from friends, and consumed by some unconscious fear of my own mourning, I slowed down watching the show, and gradually fell further and further behind.

The ending is waiting for me in the future, bittersweet and beautiful.

It will happen. Until then, Adventure Time is still happening.