Norberto "Beto" Quintanilla Iracheta (23 May 1948 – 18 March 2007) was a Mexican singer, songwriter and musician.Beto was known as "El Mero León Del Corrido" [the word "mero" is idiomatic or slang and means more than its cognate "mere"; an English translation could be "The Boss Lion Of The Corrido"].