I've been reading an interesting discussion on the Metallica board (
http://www.metallicabb.com/forum/viewtopic.php?t=123962) and decided to make this thread. There were some good ideas. For example, Kill 'Em All was the first pure thrash album to be released, but some argue that the songs on Slayers Show No Mercy, which came out later, were written before hand. Others are suggesting Overkill wrote a trash-esque tune. So many ideas...