During 2003 the band recorded a cover of the jazz standard "I'll See You in My Dreams" for the soundtrack of the Portuguese short zombie horror film of the same name. There is an official music video which was filmed in one day during the production of the short and under a ?2,000 budget. The song was also issued as a single in 2004, featuring the full and edited versions.

Moonspell reached the Portuguese top first with their album "Sin/Pecado", and were, along with Metallica and Iron Maiden, the only metal band to reach the first place of the Portuguese charts after the release of their latest album, "Memorial", in 2006. With "Memorial", Moonspell also became the first Portuguese heavy metal band to have a record certified gold status.

The album "Sin" was released with the word equivalent for "Sin" in every country in which it was distributed. For instance, it was named "Pecado" in Spain, "Pecato" in Italia, "Sin" in the UK, USA.

Fernando Ribeiro, Pedro Paixão, Ricardo Amorim and former member Sérgio Crestana had a side project called Dæmonarch, mainly born from a compilation of some of the ritual poetry and epic tales that Fernando Ribeiro wrote between the ages of 14 and 16, inspired by his deep interest of the occult and satanic philosophies.

The song Opium quoted one of Portuguese poet Fernando Pessoa's heteronyms, Álvaro de Campos, on his poem "Opiário" and its music video, featured the character of poet writing in a bar with the band playing

They formed in 1989 under the name of Morbid God and in 1992 they changed the name to Moonspell.