They are considered the pioneers of alternative metal in Spain with their albums Sanatorio de Muñecos (1994) and Revolución 12.111 (1996).

[3] Hamlet's history goes back to the late 1980s, when the five members decided to form a band using the name of one of the best-known works of writer William Shakespeare.

After several concerts, they recorded a mini LP titled "Hamlet" with a style influenced by the era of hard rock.

More concerts and self-promotion lead J. Molly, Luis Tárraga, Pedro Sanchez, Paco Sanchez, and Augusto Hernandez to move to Tampa, Florida in 1993 to Morrisound Studios with producer and owner Tom Morris (Sepultura, Coroner, Morbid Angel) and record their second proper album Sanatorio de Muñecos.

Without pressure, they were able to express all their musical influences (Sepultura, Pantera, Faith No More), and Hamlet formed their own sound.