This sound circulates online as a classroom meme tied to Spanish language lessons, where the Poema de Mio Cid is a standard school text about the medieval Castilian hero Rodrigo Díaz de Vivar. The rap turns that old epic into a short, memorable performance, which is why students share it as an inside joke from their language class. It has stayed popular because it makes a required reading feel fun, quotable and easy to drop into study videos and classroom humour.