The first thrash metal demo may be Metal Church's Red Skies from late 1981. Red Skies was an instrumental demo that combined elements of thrash, speed, and power metal. The single did not receive much circulation and was overshadowed by their October, 1982 demo Four Hymns.
Metallica was the second act on the scene. Metallica released the No Life 'til Leather demo in July 1982, and was the first band to release a studio LP, titled Kill 'Em All in July 1983.
sa wikipedie....
nema shta da se diskutuje, situacija je jasna... nema potrebe iko da tupi, proshetash netom i nadjesh podatke, za to i sluzi net uostalom....