from www.pdinfo.com
a list of songs in the public domain I recognized that you can remake...and even sell with or without your video

you may remember a few...

Code:
Ah! Sweet Mystery of Life
Ain't We Got Fun
Alexander's Ragtime Band
Auf Wiedersehn
Ballin' the Jack
Bill Bailey, Won't You Please Come Home
By the Light of the Silvery Moon
Come, Josephine, in My Flying Machine
Danny Boy
Gladiator's Entry (Entry of the Gladiators)
Hail Hail the Gang's All Here
How Dry I Am
I'm Just Wild About Harry
In the Good Old Summertime
Oh You Beautiful Doll
Oh! How I Hate to Get Up in the Morning
The Old Grey Mare
Old MacDonald Had a Farm
The Old Rugged Cross
Over There
Pomp and Circimstance
Swanee
Take Me Out to the Ball Game
There'll Be Some Changes Made
Till We Meet Again
Too-ra-loo-ra-loo-ral, That's and Irish Lullaby
Toot Toot Tootsie
When Irish Eyes Are Smiling
You're a Grand Old Flag
How dry I am? hic
Gladiator's Entry is used in the circus a lot
as a muse, I was thinking of remaking a few meself...with or without the lyrics