Trivia: Carlos Gallardo, who played El Mariachi in the prequel to Desperado, El Mariachi (1992), was given a minor role in Desperado as Campa, the mariachi with the two machine-gun guitar cases.
Trivia: The same Ford pickup truck that was used (over and over again) in El Mariachi can be seen when he crosses a street near the beginning, you don't need to look very hard to find it.
Trivia: The American girl who is criticising the service in the Tarasco Bar (just before Quentin Tarantino walks in) is actually Robert Rodriguez's sister.
Trivia: Made for just $7m, but that was a thousand times more than the budget for El Mariachi.
Trivia: Despite playing a fairly prominent character, Danny Trejo does not have a single line of dialogue throughout the entire movie.
Trivia: The gun shaped like a penis from From Dusk Till Dawn is in Antonio Banderas' guitar case in this movie.
Answer: It is called "Pass The Hatchet", and it is written by Ray Theriot, Roger Leon Jr. & Earl Stanley Oropeza. It was performed by Roger & The Gypsies. If you buy the soundtrack CD, it is on there, too.
Deezul