Aeolian was a song-like language spoken by the species of the same name. In 2050, a female Aeolian survivor arrived on Earth and used her mating call to try to contact her mate. It caused massive storms across the United Kingdom. K9 confronted her and spoke to her in Aeolian. He communicated with her even though, as he himself noted, his Aeolian was "a little rusty." (TV: Aeolian)