There's not much to it - mostly instrumental.

NEW SPANISH TWO STEP
(B. Wills/T. Duncan)

Down below the Rio Grande,
A señorita held my hand
And sweetly sang an old melody.
Without a worry or a care,
A rose she gave me from her hair,
Then she whispered: 'Si, señor, si, si'

In a cabaret, we danced the hours away.
Her eyes told more than words e'er could say.
I told her I had to go, left her down in Mexico.
The band played Spanish two-step soft and low.

Instrumental

I told her I had to go, left her down in Mexico.
The band played Spanish two-step soft and low.

Source: transcription of Bob Wills & His Texas Playboys 'New Spanish Two-Step' recorded in Hollywood, California, 3 October 1945. Reissued on CD 3, 'Just A Plain Old Country Boy', of Bob Wills & His Texas Playboys 'Take Me Back To Tulsa' Properbox 32, Proper Records.

--Stewie.