"El Rio del Tiempo" was the background song played in the ride of the same name located at the Mexico Pavilion in World Showcase at EPCOT from 1982 to 2007. It was written by X Atencio and composed by Armando Corral.
Lyrics
Welcome mis amigos
To friendly Mexico
To the land of fiestas
They're everywhere you go
Listen to marimbas
And mariachis too
Playing Latin rhythm
And serenading you
Come join the crowd
The music's good and loud
The air is full of song
So come and sing along
Because in Mexico
When people smile at you
There's just one thing to do
You join the fiesta too
So long, happy people
We hate to see you go
Hurry back, amigos
To friendly Mexico
Come on back to Taxco
To Acapulco too
Pretty señoritas
And charros wait for you
We'll meet again
In tropical Cancún
In charming Mazatlán
Or maybe in Tulum
Because in Mexico
When folks meet now and then
They never say goodbye
It's 'till we meet again