Were The Sandpipers Hispanic? Did they specialize in Spanish-language lyrics, or adaptations of Latin American songs?

As I remember their sound, it was very prettified, nice high-pitched harmonies in a fairly lush setting of pop orchestration. Not especially "Latin" in any of the usual senses; certainly not rhythmically.

After forgetting about them for years, about ten years or so ago I heard their contribution to an album consisting of nothing but varous versions of the frat-rock classic "Louie Louie." The Sandpipiers rendition was unique and unbelievable: slow and sappy, with syrupy strings, and . . . sung in Spanish!

I'm wondering now, after learning (above) that they released an LP called "The Spanish Album," if their cover of "Louie Louie" was on that particular album, or if there was any other explanation for their translating it.