Better known as Strange Complex or Cheer, Complex is a song released in the 1980s by the band HET, which consisted of Kornel Vogt, Franz Frosch, Philippe Vaucher, and, occasionally, Eva Frosch and Rahel Basler. This song was later compiled on a cassette with several other tracks by a radio listener of unknown identity. Thus, when the song was formatted and uploaded to the internet, it fell into the Lost Media category, which is the definition for audio, video, and even image files whose origin and authorship are unknown.

Since the band didn't have much international exposure, internet detectives searched everywhere until they finally found the real name of the work and its authors.

Complex uses synthesizer and tuba samples to accompany sexually themed lyrics, in which the lyrical voice tells us about his dependent and submissive relationship with a woman who is more socially positioned than him, and how she decides when and where they will meet.

The word Complex can be translated into Spanish as "complex, disorder, syndrome," so, considering the lyrics, it refers to the woman in question's preferred method of having sex.

You may say she only likes my sex
It's not to cause a strange complex
That even though our problem is
Only like to mind her smell of piss