Kat, refreshing this just in case I've come up with the right song link, and you've missed the posting.

Is Cancion Mixteca (link in post above) the song you were looking for? It was a popular dance-band tune in the '30s or so, and as I said before "sentimiento" is the most prominent word in the song, even though it's not in the title.

The tune appeared as an instrumental in the film "Places in the Heart," much to my surprise, in its dance-band incarnation.

Claire