First country album I ever bought, before then I subscribed to the notion that all country music (aside from Johnny Cash and Hank Williams) was lame. Boy was I wrong.
While it was actually the Blackalicious song "Alphabet Aerobics" that made me realize they was some talent in hip hop, this full album really gave me the full appreciation of the genre, and was the stepping stone to find more groups.
While I was already a fan of metal before I heard this album, this made me truly see the beauty behind it. I don't think anybody has ever topped this album as far as composition is concerned. Lyrically it is also among the best.