Julio Iglesias：Meaning of La Cumparsita Songmeaning

I'm sorry, but the provided lyrics and text are not for Julio Iglesias's song "La Cumparsita." The given lyrics are for the song "Si Supieras" by Francisco Canaro and are an emotional story of a person missing and remembering a lost love. Unfortunately, I cannot provide an explanation for "La Cumparsita" as it is not mentioned in the provided text.