Angra - Holy Live - Encyclopaedia Metallum: The Metal Archives

Death Metal Underground » Metal-Archives' Marxist Mania

What are some bands that are considered metal but shouldn't be? - Quora

music review/Interviews – Metal lab Reviews/ Interviews

Angra - Rebirth World Tour - Part 1 (Live in Rio de Janeiro 2001) - Encyclopaedia Metallum: The Metal Archives

DragonForce - Sonic Firestorm - Reviews - Encyclopaedia Metallum: The Metal Archives

Angra - Holy Land / Live Acoustic at Fnac - Encyclopaedia Metallum: The Metal Archives

Heavy metal music - Wikipedia

Why is DragonForce so rarely talked about as one of the best metal bands? - Quora

Pesado - Origem e Consolidação do Metal em Pernambuco by PEsado O livro - Issuu

The Metal lab – music review/Interviews