Quarteto 1111 was founded in 1967 in Estoril and is one of the most influential progressive rock bands in Portugal. Originally formed by Miguel Artur da Silveira (Drums), José Cid (Vocals and Keyboard), António Moniz Pereira (Guitar) and Jorge Moniz Pereira (Bass). It was one of the many musical groups inspired in The Shadows, the Mystery Group (Conjunto Mistério), later called Quarteto 1111. The name was inspired by the telephone number where the rehearsals occurred.

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