Well, people know there were Venom, Motorhead, Angel Witch, Mercyful Fate , but serious thrash and death began when these 3 excited Venomaniacs from Switzerland started Hellhammer with (in a way) a punk spirit (do it yourself way of life). It wasn’t perfect, but the ugliness and raw side of their heavy metal, in a way, opened the gate to death metal and also the second wave of black metal. If you want to understand Obituary, Possessed, early Mayhem, Necrophagia, Morbid Angel and so on, start here with this cult release!!!!!