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Metal | Definition, Characteristics, Types, & Facts | Britannica
Metal - Wikipedia
Metal - Wikipedia, la enciclopedia libre
Metales: propiedades, tipos, usos, ejemplos - Lifeder
Essential Heavy Metal - YouTube Music
Metal Hotlist - YouTube Music
Home - Encyclopaedia Metallum: The Metal Archives
Heavy metal - Wikipedia, la enciclopedia libre
The 100 Greatest Metal Albums of All Time - Rolling Stone
The 100 Greatest Heavy Metal Songs of All Time - Rolling Stone