it has all been done.....
ever since the first gregorian chant.
 

Are we talking about the native Australians?  Or are those guys the aboriginals?

There's nothing you can do that can't be done, nothing you can sing that can't be sung...
 
And if it can be sung, it has been, is and will be again...

"Ode to a Stinky Basket O'briefs."
 
I wore you, and wore you, and wore you for daze
you stink, you stink, you basket o'briefs.
I used to like Oprah, and donuts with glaze,
now I feel trees have not got enough leafs.
 
(chorus)
 
Jimmy Fallon comes at late night.
I like to do my laundry then.
Will you put my socks in your mouth
and wash em down with ketchup
 
(vs 2)
 
to be continued...

Of course you can write an original song, probably even an original melody.
 
My cat  does this all the time if I leave the keyboard turned on when I go to the John. The most original stuff is pretty ugly though.
 
Beauty is a cliche.
 

I think "Original" would be a great name for a cover band.

Don't worry what has gone on before Tom. Write what's in your heart or on your mind. No one is going to say it sing it or play it like you. So express yourself! I know I do and so do most of the others here I Am still speaking to. 
 
P.S. jbow wrote the most incredible lyrics I've ever read. The tears still linger minutes after I think of them!  I Am immediately going to BBQ some Becan! 

Mmmmm BECAN!!!

Write like there's no tomorrow.  When tomorrow comes, worry about it then.

Mmmmm becan!