The fact that this song was made because the fans thought that a teased scene from ii2 14 was gonna be a song scene, fans dubbing it 'Testtube Tango'. The teased scene was the one with the fireworks when testtube says "you did it, you all did it!" (If im correct) The song was later on used as ambiance in iii5, just before cabby & testtube get into an argument I think.
i can't express how much i love test tube's tango, it has their own inderciptible esscence, but i really love how every intrument ataches each other as they play this magnificent piece of art..