what was their first song or album?
Song "Aggressive Perfector" for "Metal Massacre III" compilation album
Slayer
Impressed with Slayer, he met with the band backstage and asked them to record an original song for his upcoming "Metal Massacre III" compilation album. The band agreed and their song "Aggressive Perfector" created an underground buzz upon its release in mid 1983, 
is reign in blood a song? No. It is a studio album whose? American thrash metal band Slayer can you name the members? Kerry King, Jeff Hanneman, Dave Lombardo and Tom Araya when was it recorded? UNANSWERABLE any song from the album? Raining Blood and Angel of Death when did the third member leave the band? Late 1986 who wrote the former song? Jeff Hanneman and Kerry King where was it live performed? It is an almost permanent addition to Slayer's live set-list when was the band formed? 1981
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Slayer [SEP] Early years (1981–1983)
The band was spotted by Brian Slagel, a former music journalist who had recently founded Metal Blade Records. Impressed with Slayer, he met with the band backstage and asked them to record an original song for his upcoming "Metal Massacre III" compilation album. The band agreed and their song "Aggressive Perfector" created an underground buzz upon its release in mid 1983, which led to Slagel offering the band a recording contract with Metal Blade.