Barenaked Ladies.
The Big Bang Theory Lyrics:

Our whole universe was in a hot dense state,
Then nearly fourteen billion years ago expansion started. Wait...
The Earth began to cool,
The autotrophs began to drool,
Neanderthals developed tools,
We built a wall (we built the pyramids),
Math, science, history, unravelling the mystery,
That all started with the big bang! BANG!

"Since the dawn of man" is really not that long,
As every galaxy was formed in less time
than it takes to sing this song.
A fraction of a second and the elements were made.
The bipeds stood up straight,
The dinosaurs all met their fate,
They tried to leap but they were late
And they all died (they froze their asses off)
The ocean said "Pangaea?
"See ya, wouldn't wanna be ya!"
Set in motion by the same big bang!

It all started with a big BANG!

It's expanding ever outward but one day
It will pause, then start to go the other way,
Collapsing ever inward,
we won't be here, it wont be heard
Our best and brightest figure that
it'll make an even bigger bang!

Australopithecus would really have been sick of us
Debating how we're here,
they're catching deer (we're catching viruses)
Religion or astronomy (Descartes or Deuteronomy)
It all started with a big bang!

Music and mythology (Einstein and astrology)
It all started with a big bang!
It all started with a big BANG!