Both of these records represent the European fascination with Tango. While they contain classic Argentine compositions (like "Adios Muchachos"), they are arranged in a style that was very popular for European ballroom dancing salons in the 70s and 80s, which is often slightly more rigid or "orchestral" than the traditional tango from Buenos Aires.
They are nice examples of "Mood Music" or "Ballroom" vinyl from that era.