4X   Rollin'Rollin'Rollin... 
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               Rawhide...         
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Rough lyrics for the first two verses, as I remember them:

Rollin', rollin', rollin'
Keep those wagons rollin'
Keep those wagons rollin', rawhide
All the things I'm missin'
Good vittles, love and kissin'
Wishin' my girl was by my side 

Rollin', rollin', rollin'
Though those streams are swollen
Gotta keep 'em rollin', rawhide
Don't try and understand 'em
Just rope and throw and brand 'em
Soon we'll be livin' high and wide